This document discusses the classification and structures of different types of silicate minerals. It begins by explaining that silicates are classified based on the arrangement and polymerization of SiO4 tetrahedra. Nesosilicates contain independent SiO4 tetrahedra, such as in the minerals olivine and garnet. Inosilicates contain SiO4 tetrahedra that share oxygen atoms, forming chains, double chains, or sheets. Examples given include the single chain inosilicates pyroxenes and the double chain inosilicates amphiboles. The structures of olivine, garnet, diopside pyroxene, tremolite amphibole, and horn
The pyroxene group of minerals is a type of inosilicate that contains chains of silica tetrahedrons. There are two main types: single chain and double chain structures. This determines the cleavage angles and forms of the minerals. Common pyroxene minerals include augite, diopside, enstatite, and jadeite. They are found in mafic and ultramafic igneous rocks as well as various metamorphic rock types.
This document provides information on various members of the amphibole group of minerals. It begins with an introduction to amphiboles, noting their double chain silicate structure and presence in both igneous and metamorphic rocks. It then describes the distinguishing characteristics and chemical formulas of important orthorhombic amphiboles like anthophyllite and gedrite. Next, it covers the monoclinic amphiboles, detailing minerals in the cummingtonite, actinolite, and hornblende series as well as the sodium-bearing amphiboles glaucophane and riebeckite. Paragenesis and typical crystal habits are also discussed for each amphibole.
This document discusses the epidote group of minerals. It begins with an introduction to epidote, noting that it is the most prominent member of its mineral group. The document then covers the chemical formula, composition, atomic structure, physical properties, optical properties, and crystallization of epidote and other group members. Identification properties and associations with other minerals are also summarized. In closing, the document reviews the paragenesis and references used.
This document provides a summary of alkali feldspar and plagioclase feldspar. It discusses their crystal structure, composition, physical and optical properties, paragenesis, and applications. Alkali feldspar includes orthoclase, sanidine, and microcline. Plagioclase feldspar is a solid solution between albite and anorthite. Both have important industrial uses such as in ceramics, glass, paints, plastics, and as gemstones. The document is presented by Atish Kumar Sahoo for his MTech course at the Department of Applied Geology.
Tectonites are deformed rocks whose fabric is due to systematic movement under external forces. Their fabric reflects the deformation history. Fabric includes the geometric arrangement of mineral grains, layers, and other features at a scale that includes many samples. Tectonites can have planar (S-tectonite), linear (L-tectonite), or both (L-S tectonite) fabrics indicating different strain types. Foliations like cleavage, schistosity, and gneissosity are planar fabrics that cause rocks to break along parallel surfaces. Lineations indicate preferred linear fabrics, such as fold axes, boudins, and quartz rods. The orientation and interaction of foliations and lineations provide information about tect
The document summarizes a seminar on carbonatites. Carbonatites are igneous rocks composed of more than 50% carbonate minerals such as calcite or dolomite. They can be intrusive or extrusive. Carbonatites form from low degrees of partial melting in the mantle and have unusual geochemistry dominated by incompatible elements. They are often associated with alkaline complexes and may contain economic concentrations of rare earth elements, niobium, and fluorite. The document outlines the mineralogy, texture, classification, geochemistry, theories of origin, world occurrences, and economic importance of carbonatites.
The amphiboles are a group of chain silicate minerals with some substitution of F and Cl for OH. They have a general formula of (W,X,Y)7-8(Z4O10)2(OH)2 where W represents large cations like Ca and Na, X represents smaller cations like Mg and Fe2+, Y represents Fe3+, Ti, and Al, and Z represents Si and Al. Amphiboles have elongate prismatic crystals and two prismatic cleavages that meet at 124 degrees, whereas pyroxenes have squat prisms and cleavages that meet at 88 degrees. Common amphiboles include hornblende, tremolite, actinolite
This document summarizes several types of phyllosilicate minerals in the mica group, including their chemical formulas, crystal structures, and common occurrences. Muscovite, biotite, and phlogopite are some of the most common micas. They have layered structures and perfect basal cleavage. Muscovite is widely used in electrical and insulation applications due to its properties. The document also describes lepidolite and its identification by lithium content and lilac color.
The pyroxene group of minerals is a type of inosilicate that contains chains of silica tetrahedrons. There are two main types: single chain and double chain structures. This determines the cleavage angles and forms of the minerals. Common pyroxene minerals include augite, diopside, enstatite, and jadeite. They are found in mafic and ultramafic igneous rocks as well as various metamorphic rock types.
This document provides information on various members of the amphibole group of minerals. It begins with an introduction to amphiboles, noting their double chain silicate structure and presence in both igneous and metamorphic rocks. It then describes the distinguishing characteristics and chemical formulas of important orthorhombic amphiboles like anthophyllite and gedrite. Next, it covers the monoclinic amphiboles, detailing minerals in the cummingtonite, actinolite, and hornblende series as well as the sodium-bearing amphiboles glaucophane and riebeckite. Paragenesis and typical crystal habits are also discussed for each amphibole.
This document discusses the epidote group of minerals. It begins with an introduction to epidote, noting that it is the most prominent member of its mineral group. The document then covers the chemical formula, composition, atomic structure, physical properties, optical properties, and crystallization of epidote and other group members. Identification properties and associations with other minerals are also summarized. In closing, the document reviews the paragenesis and references used.
This document provides a summary of alkali feldspar and plagioclase feldspar. It discusses their crystal structure, composition, physical and optical properties, paragenesis, and applications. Alkali feldspar includes orthoclase, sanidine, and microcline. Plagioclase feldspar is a solid solution between albite and anorthite. Both have important industrial uses such as in ceramics, glass, paints, plastics, and as gemstones. The document is presented by Atish Kumar Sahoo for his MTech course at the Department of Applied Geology.
Tectonites are deformed rocks whose fabric is due to systematic movement under external forces. Their fabric reflects the deformation history. Fabric includes the geometric arrangement of mineral grains, layers, and other features at a scale that includes many samples. Tectonites can have planar (S-tectonite), linear (L-tectonite), or both (L-S tectonite) fabrics indicating different strain types. Foliations like cleavage, schistosity, and gneissosity are planar fabrics that cause rocks to break along parallel surfaces. Lineations indicate preferred linear fabrics, such as fold axes, boudins, and quartz rods. The orientation and interaction of foliations and lineations provide information about tect
The document summarizes a seminar on carbonatites. Carbonatites are igneous rocks composed of more than 50% carbonate minerals such as calcite or dolomite. They can be intrusive or extrusive. Carbonatites form from low degrees of partial melting in the mantle and have unusual geochemistry dominated by incompatible elements. They are often associated with alkaline complexes and may contain economic concentrations of rare earth elements, niobium, and fluorite. The document outlines the mineralogy, texture, classification, geochemistry, theories of origin, world occurrences, and economic importance of carbonatites.
The amphiboles are a group of chain silicate minerals with some substitution of F and Cl for OH. They have a general formula of (W,X,Y)7-8(Z4O10)2(OH)2 where W represents large cations like Ca and Na, X represents smaller cations like Mg and Fe2+, Y represents Fe3+, Ti, and Al, and Z represents Si and Al. Amphiboles have elongate prismatic crystals and two prismatic cleavages that meet at 124 degrees, whereas pyroxenes have squat prisms and cleavages that meet at 88 degrees. Common amphiboles include hornblende, tremolite, actinolite
This document summarizes several types of phyllosilicate minerals in the mica group, including their chemical formulas, crystal structures, and common occurrences. Muscovite, biotite, and phlogopite are some of the most common micas. They have layered structures and perfect basal cleavage. Muscovite is widely used in electrical and insulation applications due to its properties. The document also describes lepidolite and its identification by lithium content and lilac color.
Interference colour and interference figuresShivam Jain
This document discusses interference colors and interference figures seen in anisotropic minerals under polarized light microscopy. It describes how interference colors are produced when minerals are rotated to their extinction positions. It also explains different types of interference figures seen in uniaxial and biaxial minerals, including centered optic axis, acute bisectrix, and how accessory plates can determine optic sign. Accessory plates like gypsum, mica, and quartz wedges are inserted to observe color changes in the interference figures that indicate whether minerals are positive or negative uniaxial and positive or negative biaxial.
This document provides an overview of kimberlites. It discusses that kimberlites are volatile-rich, ultrapotassic igneous rocks that occur as small volcanic pipes and intrusions. They are composed mainly of olivine, phlogopite, ilmenite, garnet and pyroxenes. Kimberlites are divided into two groups based on their mineralogy and isotopic signatures. Group I kimberlites are dominated by olivine and ilmenite while Group II are micaceous and enriched in rare earth elements. Kimberlites are economically important as they are the primary source of diamonds, with only a small fraction of pipes containing gem-quality stones. They
This document discusses the Dharwar Super Group found in the Dharwar Craton of India. The Dharwar Craton is divided into the Western and Eastern Dharwar cratons, separated by the Chitradurga shear zone. The Western Dharwar craton contains two prominent super belts: the Bababudan-Western Ghats-Shimoga super belt and the Chitradurga-Gadag super belt, which are part of the Dharwar super group. The Eastern Dharwar craton also contains formations from the Dharwar super group, divided into the Kolar and Yashwantanagar formations. The document concludes that the Dharwar super
This document discusses optical analysis techniques for studying ore textures. It defines ore texture as the spatial arrangement of minerals within an ore, describing attributes like grain size, shape, and mineral distribution. It outlines how optical mineralogy can be used to determine rock type, crystallization sequence, pressure-temperature history, and alteration. Isotropic and anisotropic materials are described, with most minerals being anisotropic where their properties depend on orientation. Optical microscopy uses a petrographic microscope to examine thin sections based on light absorption and propagation through minerals. Examples of magmatic ore textures include cumulus textures from crystal settling and intergranular textures where late-stage ore minerals fill spaces between earlier gangue minerals. Exsolution textures also form in
Minerals Used In Refractory Industries by Jatin Pant.pptxasdfg484362
1. Refractory minerals are minerals that can withstand high temperatures, sudden temperature changes, abrasion, and shock. They are used to line furnaces, incinerators, spark plugs, kilns, and other industrial equipment operating under extreme conditions.
2. Refractory minerals are divided into acid, neutral, and basic categories based on their reaction with slags. Common acid refractories include silica, fire clay, and ball clay. Common neutral refractories include chromite, graphite, and asbestos. Common basic refractories include magnesite and dolomite.
3. Major deposits of refractory minerals are found in India in states like Jharkhand, Karnataka
The document discusses lead and zinc minerals found in India. It describes the world class lead-zinc ore body discovered in Zawar, Rajasthan in 1977. The important lead mineral is galena and the important zinc mineral is sphalerite. It details the properties, origins, occurrences and uses of galena and sphalerite. The Zawar deposit is a cavity filling deposit formed in dolomite rock through the solution of minerals in rock openings. Lead and zinc have many industrial uses such as in batteries, alloys, coatings and more. India is a major producer of zinc, led by the deposits in the Zawar area.
The document discusses the structure of silicate minerals. It notes that approximately 90% of the Earth's crust is composed of silicates where silicon and oxygen bonds form different minerals depending on the cations and anions present. The fundamental building block of silicate structures is the silicon-oxygen tetrahedron. Tetrahedra can be linked through shared oxygen atoms in different configurations giving rise to diverse silicate structures. Silicate minerals include nesosilicates with isolated tetrahedra, inosilicates with tetrahedra linked in chains, and double chain silicates.
Metallogenic Epoch and Province
Metallogenetic Epochs
Metallogenetic epochs, as defined above, are specific periods characterised by formation of large number of mineral deposits. It does not mean that all the mineral deposits formed during a definite metallogenetic epochs. In India the chief metallogenetic epochs were:
1. Precambrian
2. Late Palaeozoic
3. Late Mesozoic to Early Tertiary
This document provides information about amphibole group minerals. It discusses that amphiboles are double chain silicates that share properties with pyroxenes. Amphiboles have a Si:O ratio of 4:11, contain essential hydroxyl groups, and form prismatic or needle-like crystals. Several monoclinic and orthorhombic amphibole group minerals are described in detail, including their chemical formulas, crystal structures, typical occurrences, and physical properties. Prominent amphibole deposits in India are also listed.
1. The document discusses ore textures and paragenetic sequences, beginning with definitions and requirements for studying ore textures.
2. It describes various ore textures including single grain textures, magmatic ore textures, open space filling textures, and replacement textures.
3. The document concludes with a discussion on developing paragenetic sequences by analyzing features like cross-cutting relationships and exsolution textures.
This document discusses metamorphic textures, which refer to the physical appearance or arrangement of minerals in metamorphic rocks at the microscopic level. There are several types of textures that can form during metamorphism due to factors like heat, pressure, and chemically active fluids. Typomorphic textures are characteristic of metamorphism and include porphyroblastic, mortar, and granoblastic textures. Relict textures are inherited from the original rock, such as ophitic or porphyritic textures. Reaction textures involve chemical reactions between minerals, forming textures like coronas or reaction rims. The document provides examples of different textures and concludes that textures provide information about the metamorphic conditions and original rock type.
The document discusses the silicate group of minerals, which are an important class of rock-forming minerals. It describes the chemical composition, atomic structure, and classification of silicates. Silicates are made up of silicon-oxygen tetrahedra that are linked together in different ways, forming independent tetrahedra, double linked tetrahedra, complex linked tetrahedra, chains, sheets, and networks. The document also discusses specific silicate mineral groups like felspars and pyroxenes, providing details on their composition, structure, and properties.
Basalt is a common volcanic rock formed from rapidly cooled lava. It most often occurs in lava flows due to its low volatile content. Basalt is composed mainly of plagioclase feldspar and pyroxene. There are three main types - tholeiitic, alkaline, and transitional - which differ in their mineral composition and origin. The massive Deccan Traps basalt deposits in India were formed from volcanic eruptions associated with the Réunion hotspot around 65 million years ago.
Silicate structure and its classificationparag sonwane
Silicates make up over 90% of the Earth's crust and are the main components of rocks. Silicate structures are based on the SiO4 tetrahedron, with silicon at the center bonded to four oxygen atoms. Silicates are classified based on the arrangement of these tetrahedra, including nesosilicates (isolated tetrahedra), sorosilicates (double tetrahedra), inosilicates (chains), phyllosilicates (sheets), and tectosilicates (3D frameworks). Common silicate minerals that illustrate these structures include olivine, epidote, pyroxene, amphibole, mica, and feldspar. The
This document discusses the Precambrian geology of the Southern Granulite Terrain of India. It describes the terrain as being composed of several blocks separated by shear zones, which experienced high-grade metamorphism and multiple periods of folding and faulting. The metamorphic history involved ultra-high temperature conditions in some areas, as evidenced by mineral assemblages. The document also outlines two competing tectonic models to explain the evolution of the related Pandyan Mobile Belt: a subduction-collision model and an accretion model.
The document provides information on crystal systems, including the isometric and tetragonal systems. It discusses the isometric system, which includes crystals with three equal perpendicular axes. It notes there are five classes in the isometric system with different forms and symmetry properties. The tetragonal system is then introduced, which includes crystals with two equal horizontal axes and a vertical axis that may be shorter or longer. There are seven classes in the tetragonal system with different forms and symmetry features. Examples of minerals that crystallize in each system are provided.
Minerals are formed by changes in chemical energy in systems which contain one fluid or vapor phase. In nature, minerals are formed by crystallisation or precipitation from concentrated solutions. These solutions are called as ore-bearing fluids. Ore-bearing fluids are characterised by high concentration of certain metallic or other elements.
Fluids are the most effective agents for the transport of material in the mantle and the Earth's crust.
India is the 4th largest producer of manganese ore in the world, with Karnataka and Orissa having some of the largest deposits. Manganese ore occurs in various forms like massive, columnar, fibrous, botryoidal, and granular deposits. It is an important raw material used in steel production and also has various other industrial applications. The key manganese ore producing states in India are Karnataka, Orissa, Maharashtra, and Madhya Pradesh, which have deposits of different types including residual, sedimentary, hydrothermal, and metamorphosed ores.
Radioactive minerals in India include uranium, thorium, and rare metals. Uranium deposits are found in three provinces - Singhbhum, Mahadek, and Cuddapah. The Singhbhum province contains vein-type deposits hosted in schist along the Singhbhum shear zone, including the major deposits at Jaduguda and Bhatin. The Mahadek province hosts large sandstone-type deposits in the Mahadek Formation such as Domiasiat. The Cuddapah province contains unconformity deposits such as Tummalapalle Rachakuntapalle and stratabound deposits. Thorium is found in monazite placers along coastal areas. Rare metals like
This document discusses the crystal structure of inosilicate minerals, specifically pyroxenes and amphiboles. It describes their structures as composed of alternating "I-beam" units formed by chains of silicate tetrahedra and metal cations in octahedral coordination. In pyroxenes, the I-beams are narrow single chains, while in amphiboles they are wider double chains. This difference leads to pyroxenes exhibiting 90-degree cleavages and amphiboles exhibiting 60-120 degree cleavages. The document also notes the variable compositions possible in amphiboles due to their multiple crystallographic sites.
Mineralogy and crystallography notes notes Pramoda Raj
This document provides information on the mineral olivine and includes:
1) A description of olivine's crystal structure, composition, and optical properties.
2) Details on common species of olivine defined by their magnesium and iron content.
3) Explanations of olivine's formation, alteration products, and typical geological environments.
Interference colour and interference figuresShivam Jain
This document discusses interference colors and interference figures seen in anisotropic minerals under polarized light microscopy. It describes how interference colors are produced when minerals are rotated to their extinction positions. It also explains different types of interference figures seen in uniaxial and biaxial minerals, including centered optic axis, acute bisectrix, and how accessory plates can determine optic sign. Accessory plates like gypsum, mica, and quartz wedges are inserted to observe color changes in the interference figures that indicate whether minerals are positive or negative uniaxial and positive or negative biaxial.
This document provides an overview of kimberlites. It discusses that kimberlites are volatile-rich, ultrapotassic igneous rocks that occur as small volcanic pipes and intrusions. They are composed mainly of olivine, phlogopite, ilmenite, garnet and pyroxenes. Kimberlites are divided into two groups based on their mineralogy and isotopic signatures. Group I kimberlites are dominated by olivine and ilmenite while Group II are micaceous and enriched in rare earth elements. Kimberlites are economically important as they are the primary source of diamonds, with only a small fraction of pipes containing gem-quality stones. They
This document discusses the Dharwar Super Group found in the Dharwar Craton of India. The Dharwar Craton is divided into the Western and Eastern Dharwar cratons, separated by the Chitradurga shear zone. The Western Dharwar craton contains two prominent super belts: the Bababudan-Western Ghats-Shimoga super belt and the Chitradurga-Gadag super belt, which are part of the Dharwar super group. The Eastern Dharwar craton also contains formations from the Dharwar super group, divided into the Kolar and Yashwantanagar formations. The document concludes that the Dharwar super
This document discusses optical analysis techniques for studying ore textures. It defines ore texture as the spatial arrangement of minerals within an ore, describing attributes like grain size, shape, and mineral distribution. It outlines how optical mineralogy can be used to determine rock type, crystallization sequence, pressure-temperature history, and alteration. Isotropic and anisotropic materials are described, with most minerals being anisotropic where their properties depend on orientation. Optical microscopy uses a petrographic microscope to examine thin sections based on light absorption and propagation through minerals. Examples of magmatic ore textures include cumulus textures from crystal settling and intergranular textures where late-stage ore minerals fill spaces between earlier gangue minerals. Exsolution textures also form in
Minerals Used In Refractory Industries by Jatin Pant.pptxasdfg484362
1. Refractory minerals are minerals that can withstand high temperatures, sudden temperature changes, abrasion, and shock. They are used to line furnaces, incinerators, spark plugs, kilns, and other industrial equipment operating under extreme conditions.
2. Refractory minerals are divided into acid, neutral, and basic categories based on their reaction with slags. Common acid refractories include silica, fire clay, and ball clay. Common neutral refractories include chromite, graphite, and asbestos. Common basic refractories include magnesite and dolomite.
3. Major deposits of refractory minerals are found in India in states like Jharkhand, Karnataka
The document discusses lead and zinc minerals found in India. It describes the world class lead-zinc ore body discovered in Zawar, Rajasthan in 1977. The important lead mineral is galena and the important zinc mineral is sphalerite. It details the properties, origins, occurrences and uses of galena and sphalerite. The Zawar deposit is a cavity filling deposit formed in dolomite rock through the solution of minerals in rock openings. Lead and zinc have many industrial uses such as in batteries, alloys, coatings and more. India is a major producer of zinc, led by the deposits in the Zawar area.
The document discusses the structure of silicate minerals. It notes that approximately 90% of the Earth's crust is composed of silicates where silicon and oxygen bonds form different minerals depending on the cations and anions present. The fundamental building block of silicate structures is the silicon-oxygen tetrahedron. Tetrahedra can be linked through shared oxygen atoms in different configurations giving rise to diverse silicate structures. Silicate minerals include nesosilicates with isolated tetrahedra, inosilicates with tetrahedra linked in chains, and double chain silicates.
Metallogenic Epoch and Province
Metallogenetic Epochs
Metallogenetic epochs, as defined above, are specific periods characterised by formation of large number of mineral deposits. It does not mean that all the mineral deposits formed during a definite metallogenetic epochs. In India the chief metallogenetic epochs were:
1. Precambrian
2. Late Palaeozoic
3. Late Mesozoic to Early Tertiary
This document provides information about amphibole group minerals. It discusses that amphiboles are double chain silicates that share properties with pyroxenes. Amphiboles have a Si:O ratio of 4:11, contain essential hydroxyl groups, and form prismatic or needle-like crystals. Several monoclinic and orthorhombic amphibole group minerals are described in detail, including their chemical formulas, crystal structures, typical occurrences, and physical properties. Prominent amphibole deposits in India are also listed.
1. The document discusses ore textures and paragenetic sequences, beginning with definitions and requirements for studying ore textures.
2. It describes various ore textures including single grain textures, magmatic ore textures, open space filling textures, and replacement textures.
3. The document concludes with a discussion on developing paragenetic sequences by analyzing features like cross-cutting relationships and exsolution textures.
This document discusses metamorphic textures, which refer to the physical appearance or arrangement of minerals in metamorphic rocks at the microscopic level. There are several types of textures that can form during metamorphism due to factors like heat, pressure, and chemically active fluids. Typomorphic textures are characteristic of metamorphism and include porphyroblastic, mortar, and granoblastic textures. Relict textures are inherited from the original rock, such as ophitic or porphyritic textures. Reaction textures involve chemical reactions between minerals, forming textures like coronas or reaction rims. The document provides examples of different textures and concludes that textures provide information about the metamorphic conditions and original rock type.
The document discusses the silicate group of minerals, which are an important class of rock-forming minerals. It describes the chemical composition, atomic structure, and classification of silicates. Silicates are made up of silicon-oxygen tetrahedra that are linked together in different ways, forming independent tetrahedra, double linked tetrahedra, complex linked tetrahedra, chains, sheets, and networks. The document also discusses specific silicate mineral groups like felspars and pyroxenes, providing details on their composition, structure, and properties.
Basalt is a common volcanic rock formed from rapidly cooled lava. It most often occurs in lava flows due to its low volatile content. Basalt is composed mainly of plagioclase feldspar and pyroxene. There are three main types - tholeiitic, alkaline, and transitional - which differ in their mineral composition and origin. The massive Deccan Traps basalt deposits in India were formed from volcanic eruptions associated with the Réunion hotspot around 65 million years ago.
Silicate structure and its classificationparag sonwane
Silicates make up over 90% of the Earth's crust and are the main components of rocks. Silicate structures are based on the SiO4 tetrahedron, with silicon at the center bonded to four oxygen atoms. Silicates are classified based on the arrangement of these tetrahedra, including nesosilicates (isolated tetrahedra), sorosilicates (double tetrahedra), inosilicates (chains), phyllosilicates (sheets), and tectosilicates (3D frameworks). Common silicate minerals that illustrate these structures include olivine, epidote, pyroxene, amphibole, mica, and feldspar. The
This document discusses the Precambrian geology of the Southern Granulite Terrain of India. It describes the terrain as being composed of several blocks separated by shear zones, which experienced high-grade metamorphism and multiple periods of folding and faulting. The metamorphic history involved ultra-high temperature conditions in some areas, as evidenced by mineral assemblages. The document also outlines two competing tectonic models to explain the evolution of the related Pandyan Mobile Belt: a subduction-collision model and an accretion model.
The document provides information on crystal systems, including the isometric and tetragonal systems. It discusses the isometric system, which includes crystals with three equal perpendicular axes. It notes there are five classes in the isometric system with different forms and symmetry properties. The tetragonal system is then introduced, which includes crystals with two equal horizontal axes and a vertical axis that may be shorter or longer. There are seven classes in the tetragonal system with different forms and symmetry features. Examples of minerals that crystallize in each system are provided.
Minerals are formed by changes in chemical energy in systems which contain one fluid or vapor phase. In nature, minerals are formed by crystallisation or precipitation from concentrated solutions. These solutions are called as ore-bearing fluids. Ore-bearing fluids are characterised by high concentration of certain metallic or other elements.
Fluids are the most effective agents for the transport of material in the mantle and the Earth's crust.
India is the 4th largest producer of manganese ore in the world, with Karnataka and Orissa having some of the largest deposits. Manganese ore occurs in various forms like massive, columnar, fibrous, botryoidal, and granular deposits. It is an important raw material used in steel production and also has various other industrial applications. The key manganese ore producing states in India are Karnataka, Orissa, Maharashtra, and Madhya Pradesh, which have deposits of different types including residual, sedimentary, hydrothermal, and metamorphosed ores.
Radioactive minerals in India include uranium, thorium, and rare metals. Uranium deposits are found in three provinces - Singhbhum, Mahadek, and Cuddapah. The Singhbhum province contains vein-type deposits hosted in schist along the Singhbhum shear zone, including the major deposits at Jaduguda and Bhatin. The Mahadek province hosts large sandstone-type deposits in the Mahadek Formation such as Domiasiat. The Cuddapah province contains unconformity deposits such as Tummalapalle Rachakuntapalle and stratabound deposits. Thorium is found in monazite placers along coastal areas. Rare metals like
This document discusses the crystal structure of inosilicate minerals, specifically pyroxenes and amphiboles. It describes their structures as composed of alternating "I-beam" units formed by chains of silicate tetrahedra and metal cations in octahedral coordination. In pyroxenes, the I-beams are narrow single chains, while in amphiboles they are wider double chains. This difference leads to pyroxenes exhibiting 90-degree cleavages and amphiboles exhibiting 60-120 degree cleavages. The document also notes the variable compositions possible in amphiboles due to their multiple crystallographic sites.
Mineralogy and crystallography notes notes Pramoda Raj
This document provides information on the mineral olivine and includes:
1) A description of olivine's crystal structure, composition, and optical properties.
2) Details on common species of olivine defined by their magnesium and iron content.
3) Explanations of olivine's formation, alteration products, and typical geological environments.
The document discusses the composition of the Earth's crust at different scales, from the global scale down to the atomic scale. It focuses on the eight most common elements in the crust - oxygen, silicon, aluminum, iron, calcium, sodium, potassium, and magnesium. These elements form minerals by bonding together at the atomic level. Minerals are the building blocks of rocks. Many important rock-forming minerals are silicates that are made up of silica tetrahedra bonded together in different arrangements. Common silicate minerals include olivine, pyroxenes, amphiboles, micas, feldspars, and quartz.
The document discusses the key differences between metals and non-metals, the sources and extraction of metals from ores, the formation of alloys through the addition of other metals, examples of main group metals important in biology, and the properties, electronic configurations, and common oxidation states of transition metals.
B sc_I_General chemistry U-IV Ligands and chelates Rai University
This document provides an overview of transition metals and their properties. It discusses the electronic configurations of transition metals and how they can exhibit multiple oxidation states. It describes the formation of complexes between transition metals and ligands. Common ligands include ammonia, cyanide, and ethylenediamine. The document outlines the naming conventions for complexes and discusses different coordination geometries such as octahedral and square planar. It also introduces the concept of isomers in complexes.
B sc i chemistry i u iv ligands and chelates aRai University
This document provides an overview of transition metals and their properties. It discusses the electronic configurations of transition metals and how they can exhibit multiple oxidation states. It describes the formation of complexes between transition metals and ligands. Common ligands include ammonia, cyanide, and ethylenediamine. The document outlines characteristic geometries of complexes based on coordination number, such as octahedral and square planar. It also discusses isomers, including geometric and optical isomers of complexes. Examples are provided to illustrate key concepts around transition metal complexes.
Double salts are formed when two salts crystallize together in a stoichiometric ratio from their saturated solution. They dissociate into simple ions when dissolved in water. Coordination compounds retain their identity in both the solid and dissolved states. The metal acts as a Lewis acid and provides empty orbitals to accept electrons from ligands, which act as Lewis bases by donating electron pairs. Coordination compounds have defined geometries depending on the metal's hybridization and the ligand environment. Crystal field theory and valence bond theory are used to explain properties like color and magnetism.
This document provides an overview of silicates including their preparation, types, uses, and conclusions. Silicates are derivatives of silicic acid that contain tetrahedral SiO4 anions. They are prepared by heating metal oxides or carbonates with sand. The main types of silicates discussed are ortho, pyro, cyclic, chain, sheet, and three-dimensional silicates. Silicates have many uses including in microchips, glass, ceramics, dentistry, coatings, soaps, and detergents. In conclusion, silicates are very common minerals that are important for technology and everyday life due to their chemical and structural variability.
Ceramics are inorganic materials composed of metallic and nonmetallic constituents. Crystalline ceramics can be classified based on their crystal structure, such as rock salt, cesium chloride, zinc blende, and perovskite. Ceramics exhibit properties of hardness and brittleness but also high stiffness. They are poor conductors of heat and electricity. Ceramics can be either crystalline or amorphous, like glasses. Carbon can also be classified as a ceramic due to the crystal structures of diamond and graphite.
This document provides information about ions and salts, including:
- Cations are atoms that lose electrons to form positively charged ions, while anions are atoms that gain electrons to form negatively charged ions. Common examples like NaCl are described.
- Transition metal ions and polyatomic ions that can combine to form various salts are listed, along with methods for naming monoatomic and polyatomic salts.
- Properties of salts like high melting points and conductivity are discussed briefly.
- The basics of Lewis dot structures and molecular geometry are introduced for covalent bonding in organic compounds. Electronegativity and molecular polarity are also covered.
Silicates are minerals composed of silicon and oxygen that make up approximately 90% of the Earth's crust. They exist as silicate minerals and aluminosilicate clays in the crust. Silicates can be classified based on their crystal structure as orthosilicates containing single SiO4 tetrahedra, pyrosilicates with linked pairs of tetrahedra, ring silicates containing silica rings, chain silicates with linked tetrahedral chains, sheet silicates with shared oxygen atoms between sheets, and framework silicates with a three-dimensional networked structure. Important aluminosilicates include micas, clays, zeolites, and many common rock-forming minerals.
General principles and processes of isolation of elementsniralipatil
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Scapolite and sodalite are both silicate minerals that form solid solutions. Scapolite forms a solid solution between meionite and marialite, with the general formula M4(T12O24)A. It is colorless to greenish in thin section with no pleochroism. Sodalite has the formula Na8Al6Si6O24Cl2 and is typically white, grey, yellow or pink with a vitreous luster. Both minerals are found in metamorphic rocks derived from calcareous sediments or igneous rocks like syenite. They commonly occur associated with other calc-silicate minerals.
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1. The document provides an overview of writing formulas and naming ionic and covalent compounds. It reviews the periodic table and properties of metals, nonmetals and metalloids.
2. Key concepts covered include ion formation, the octet rule, polyatomic ions, oxidation numbers, naming conventions for ionic compounds containing metals or transition metals, and prefixes used in naming covalent compounds.
3. The document distinguishes between ionic and covalent bonding, lattice structures, and molecular structures of compounds.
This document discusses coordination chemistry and isomerism in coordination compounds. It defines molecular compounds, complex salts, and double salts formed from combinations of inorganic salts. It also discusses ligands, classifying them based on properties. Coordination number and the resulting geometries for coordination numbers 2 through 9 are described. Finally, it outlines different types of isomerism that can occur in coordination compounds, including structural, spin, and stereo isomerism.
This document discusses the physical and chemical properties of metals and non-metals. It describes how metals react with oxygen, water, and acids. A reactivity series of metals is provided from most reactive to least. The document explains how ionic compounds form and their properties. The extraction of metals from ores is summarized including concentration, reduction, and refining steps. Common extraction methods are outlined for metals of high, medium, and low reactivity in the series.
This document provides information on chemical formulas, ionic compounds, and molecular compounds. It discusses how to write formulas and name compounds based on their ionic or molecular structure. Key points include:
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How to Make a Field Mandatory in Odoo 17Celine George
In Odoo, making a field required can be done through both Python code and XML views. When you set the required attribute to True in Python code, it makes the field required across all views where it's used. Conversely, when you set the required attribute in XML views, it makes the field required only in the context of that particular view.
This presentation was provided by Rebecca Benner, Ph.D., of the American Society of Anesthesiologists, for the second session of NISO's 2024 Training Series "DEIA in the Scholarly Landscape." Session Two: 'Expanding Pathways to Publishing Careers,' was held June 13, 2024.
Beyond Degrees - Empowering the Workforce in the Context of Skills-First.pptxEduSkills OECD
Iván Bornacelly, Policy Analyst at the OECD Centre for Skills, OECD, presents at the webinar 'Tackling job market gaps with a skills-first approach' on 12 June 2024
ISO/IEC 27001, ISO/IEC 42001, and GDPR: Best Practices for Implementation and...PECB
Denis is a dynamic and results-driven Chief Information Officer (CIO) with a distinguished career spanning information systems analysis and technical project management. With a proven track record of spearheading the design and delivery of cutting-edge Information Management solutions, he has consistently elevated business operations, streamlined reporting functions, and maximized process efficiency.
Certified as an ISO/IEC 27001: Information Security Management Systems (ISMS) Lead Implementer, Data Protection Officer, and Cyber Risks Analyst, Denis brings a heightened focus on data security, privacy, and cyber resilience to every endeavor.
His expertise extends across a diverse spectrum of reporting, database, and web development applications, underpinned by an exceptional grasp of data storage and virtualization technologies. His proficiency in application testing, database administration, and data cleansing ensures seamless execution of complex projects.
What sets Denis apart is his comprehensive understanding of Business and Systems Analysis technologies, honed through involvement in all phases of the Software Development Lifecycle (SDLC). From meticulous requirements gathering to precise analysis, innovative design, rigorous development, thorough testing, and successful implementation, he has consistently delivered exceptional results.
Throughout his career, he has taken on multifaceted roles, from leading technical project management teams to owning solutions that drive operational excellence. His conscientious and proactive approach is unwavering, whether he is working independently or collaboratively within a team. His ability to connect with colleagues on a personal level underscores his commitment to fostering a harmonious and productive workplace environment.
Date: May 29, 2024
Tags: Information Security, ISO/IEC 27001, ISO/IEC 42001, Artificial Intelligence, GDPR
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Chapter wise All Notes of First year Basic Civil Engineering.pptxDenish Jangid
Chapter wise All Notes of First year Basic Civil Engineering
Syllabus
Chapter-1
Introduction to objective, scope and outcome the subject
Chapter 2
Introduction: Scope and Specialization of Civil Engineering, Role of civil Engineer in Society, Impact of infrastructural development on economy of country.
Chapter 3
Surveying: Object Principles & Types of Surveying; Site Plans, Plans & Maps; Scales & Unit of different Measurements.
Linear Measurements: Instruments used. Linear Measurement by Tape, Ranging out Survey Lines and overcoming Obstructions; Measurements on sloping ground; Tape corrections, conventional symbols. Angular Measurements: Instruments used; Introduction to Compass Surveying, Bearings and Longitude & Latitude of a Line, Introduction to total station.
Levelling: Instrument used Object of levelling, Methods of levelling in brief, and Contour maps.
Chapter 4
Buildings: Selection of site for Buildings, Layout of Building Plan, Types of buildings, Plinth area, carpet area, floor space index, Introduction to building byelaws, concept of sun light & ventilation. Components of Buildings & their functions, Basic concept of R.C.C., Introduction to types of foundation
Chapter 5
Transportation: Introduction to Transportation Engineering; Traffic and Road Safety: Types and Characteristics of Various Modes of Transportation; Various Road Traffic Signs, Causes of Accidents and Road Safety Measures.
Chapter 6
Environmental Engineering: Environmental Pollution, Environmental Acts and Regulations, Functional Concepts of Ecology, Basics of Species, Biodiversity, Ecosystem, Hydrological Cycle; Chemical Cycles: Carbon, Nitrogen & Phosphorus; Energy Flow in Ecosystems.
Water Pollution: Water Quality standards, Introduction to Treatment & Disposal of Waste Water. Reuse and Saving of Water, Rain Water Harvesting. Solid Waste Management: Classification of Solid Waste, Collection, Transportation and Disposal of Solid. Recycling of Solid Waste: Energy Recovery, Sanitary Landfill, On-Site Sanitation. Air & Noise Pollution: Primary and Secondary air pollutants, Harmful effects of Air Pollution, Control of Air Pollution. . Noise Pollution Harmful Effects of noise pollution, control of noise pollution, Global warming & Climate Change, Ozone depletion, Greenhouse effect
Text Books:
1. Palancharmy, Basic Civil Engineering, McGraw Hill publishers.
2. Satheesh Gopi, Basic Civil Engineering, Pearson Publishers.
3. Ketki Rangwala Dalal, Essentials of Civil Engineering, Charotar Publishing House.
4. BCP, Surveying volume 1
LAND USE LAND COVER AND NDVI OF MIRZAPUR DISTRICT, UPRAHUL
This Dissertation explores the particular circumstances of Mirzapur, a region located in the
core of India. Mirzapur, with its varied terrains and abundant biodiversity, offers an optimal
environment for investigating the changes in vegetation cover dynamics. Our study utilizes
advanced technologies such as GIS (Geographic Information Systems) and Remote sensing to
analyze the transformations that have taken place over the course of a decade.
The complex relationship between human activities and the environment has been the focus
of extensive research and worry. As the global community grapples with swift urbanization,
population expansion, and economic progress, the effects on natural ecosystems are becoming
more evident. A crucial element of this impact is the alteration of vegetation cover, which plays a
significant role in maintaining the ecological equilibrium of our planet.Land serves as the foundation for all human activities and provides the necessary materials for
these activities. As the most crucial natural resource, its utilization by humans results in different
'Land uses,' which are determined by both human activities and the physical characteristics of the
land.
The utilization of land is impacted by human needs and environmental factors. In countries
like India, rapid population growth and the emphasis on extensive resource exploitation can lead
to significant land degradation, adversely affecting the region's land cover.
Therefore, human intervention has significantly influenced land use patterns over many
centuries, evolving its structure over time and space. In the present era, these changes have
accelerated due to factors such as agriculture and urbanization. Information regarding land use and
cover is essential for various planning and management tasks related to the Earth's surface,
providing crucial environmental data for scientific, resource management, policy purposes, and
diverse human activities.
Accurate understanding of land use and cover is imperative for the development planning
of any area. Consequently, a wide range of professionals, including earth system scientists, land
and water managers, and urban planners, are interested in obtaining data on land use and cover
changes, conversion trends, and other related patterns. The spatial dimensions of land use and
cover support policymakers and scientists in making well-informed decisions, as alterations in
these patterns indicate shifts in economic and social conditions. Monitoring such changes with the
help of Advanced technologies like Remote Sensing and Geographic Information Systems is
crucial for coordinated efforts across different administrative levels. Advanced technologies like
Remote Sensing and Geographic Information Systems
9
Changes in vegetation cover refer to variations in the distribution, composition, and overall
structure of plant communities across different temporal and spatial scales. These changes can
occur natural.
Philippine Edukasyong Pantahanan at Pangkabuhayan (EPP) CurriculumMJDuyan
(𝐓𝐋𝐄 𝟏𝟎𝟎) (𝐋𝐞𝐬𝐬𝐨𝐧 𝟏)-𝐏𝐫𝐞𝐥𝐢𝐦𝐬
𝐃𝐢𝐬𝐜𝐮𝐬𝐬 𝐭𝐡𝐞 𝐄𝐏𝐏 𝐂𝐮𝐫𝐫𝐢𝐜𝐮𝐥𝐮𝐦 𝐢𝐧 𝐭𝐡𝐞 𝐏𝐡𝐢𝐥𝐢𝐩𝐩𝐢𝐧𝐞𝐬:
- Understand the goals and objectives of the Edukasyong Pantahanan at Pangkabuhayan (EPP) curriculum, recognizing its importance in fostering practical life skills and values among students. Students will also be able to identify the key components and subjects covered, such as agriculture, home economics, industrial arts, and information and communication technology.
𝐄𝐱𝐩𝐥𝐚𝐢𝐧 𝐭𝐡𝐞 𝐍𝐚𝐭𝐮𝐫𝐞 𝐚𝐧𝐝 𝐒𝐜𝐨𝐩𝐞 𝐨𝐟 𝐚𝐧 𝐄𝐧𝐭𝐫𝐞𝐩𝐫𝐞𝐧𝐞𝐮𝐫:
-Define entrepreneurship, distinguishing it from general business activities by emphasizing its focus on innovation, risk-taking, and value creation. Students will describe the characteristics and traits of successful entrepreneurs, including their roles and responsibilities, and discuss the broader economic and social impacts of entrepreneurial activities on both local and global scales.
2. Silicates are classified on the basis of arrangement
of sio4 and Si-O polymerism
[SiO4]4- tetrahedron is basic
building of silicates
3. Structure depend upon sharing of oxygen of basic
unit cell [SiO4]4- Independent tetrahedral Nesosilicates
e.g. olivine and garnet
[Si2O7]6- Double tetrahedra Sorosilicates
e.g. epidote
n[SiO3]2- n = 3, 4, 6 Cyclosilicates
e.g. beryl and axinite.
4. Silicates are classified on the basis of Si-O
polymerism
[SiO3]2- single chains Inosilicates [Si4O11]4- Double tetrahedra
pryoxenes pyroxenoids amphiboles
5. Silicates are classified on the basis of Si-O
polymerism
[Si2O5]2- Sheets of tetrahedra Phyllosilicates
micas talc clay minerals serpentine
6. Silicates are classified on the basis of Si-O
polymerism
[SiO2] 3-D frameworks of tetrahedra: fully polymerized Tectosilicates
quartz and the silica minerals feldspars feldspathoids zeolites
low-quartz
9. Olivine (100) view blue = M1 yellow = M2
b
c
perspective
Nesosilicates: independent SiO4 tetrahedra
10. Olivine (001) view blue = M1 yellow = M2
M1 in rows
and share
edges
M2 form
layers in a-c
that share
corners
Some M2
and M1 share
edges
b
a
Nesosilicates: independent SiO4 tetrahedra
12. Nesosilicates: independent SiO4 tetrahedra
Olivine Occurrences:
Principally in mafic and ultramafic igneous and
meta-igneous rocks
Fayalite in meta-ironstones and in some alkalic
granitoids
Forsterite in some siliceous dolomitic marbles
Monticellite CaMgSiO4
Ca M2 (larger ion, larger site)
High grade metamorphic siliceous carbonates
13. Nesosilicates: independent SiO4 tetrahedra
Garnet (001) view blue = Si purple = A turquoise = B
Garnet: A2+
3 B3+
2 [SiO4]3
“Pyralspites” - B = Al
Pyrope: Mg3 Al2 [SiO4]3
Almandine: Fe3 Al2 [SiO4]3
Spessartine: Mn3 Al2 [SiO4]3
“Ugrandites” - A = Ca
Uvarovite: Ca3 Cr2 [SiO4]3
Grossularite: Ca3 Al2 [SiO4]3
Andradite: Ca3 Fe2 [SiO4]3
Occurrence:
Mostly metamorphic
Some high-Al igneous
Also in some mantle peridotites
14. Nesosilicates: independent SiO4 tetrahedra
Garnet (001) view blue = Si purple = A turquoise = B
Garnet: A2+
3 B3+
2 [SiO4]3
“Pyralspites” - B = Al
Pyrope: Mg3 Al2 [SiO4]3
Almandine: Fe3 Al2 [SiO4]3
Spessartine: Mn3 Al2 [SiO4]3
“Ugrandites” - A = Ca
Uvarovite: Ca3 Cr2 [SiO4]3
Grossularite: Ca3 Al2 [SiO4]3
Andradite: Ca3 Fe2 [SiO4]3
Occurrence:
Mostly metamorphic
Pyralspites in meta-shales
Ugrandites in meta-carbonates
Some high-Al igneous
Also in some mantle peridotites
a1
a2
a3
15. Inosilicates: single chains- pyroxenes
Diopside (001) view blue = Si purple = M1 (Mg) yellow = M2 (Ca)
Diopside: CaMg [Si2O6]
b
asin
Where are the Si-O-Si-O chains??
21. Inosilicates: single chains- pyroxenes
Diopside (001) view blue = Si purple = M1 (Mg) yellow = M2 (Ca)
Perspective view
22. Inosilicates: single chains- pyroxenes
Diopside (001) view blue = Si purple = M1 (Mg) yellow = M2 (Ca)
SiO4 as polygons
(and larger area)
IV slab
IV slab
IV slab
IV slab
VI slab
VI slab
VI slab
b
asin
29. The pyroxene
structure is then
composed of
alternating I-beams
Clinopyroxenes have
all I-beams oriented
the same: all are (+)
in this orientation
(+)
(+)(+)
(+)(+)
Inosilicates: single chains- pyroxenes
Note that M1 sites are
smaller than M2 sites, since
they are at the apices of the
tetrahedral chains
30. The pyroxene
structure is then
composed of
alternation I-beams
Clinopyroxenes have
all I-beams oriented
the same: all are (+)
in this orientation
(+)
(+)(+)
Inosilicates: single chains- pyroxenes
(+)(+)
32. The tetrahedral chain
above the M1s is thus
offset from that below
The M2 slabs have a
similar effect
The result is a
monoclinic unit cell,
hence clinopyroxenes
Inosilicates: single chains- pyroxenes
c
a
(+) M1
(+) M2
(+) M2
33. Orthopyroxenes have
alternating (+) and (-)
I-beams
the offsets thus
compensate and result
in an orthorhombic
unit cell
This also explains the
double a cell dimension
and why orthopyroxenes
have {210} cleavages
instead of {110) as in
clinopyroxenes (although
both are at 90o)
Inosilicates: single chains- pyroxenes
c
a
(+) M1
(-) M1
(-) M2
(+) M2
34. The general pyroxene formula:
W1-P (X,Y)1+P Z2O6
Where
W = Ca Na
X = Mg Fe2+ Mn Ni Li
Y = Al Fe3+ Cr Ti
Z = Si Al
Anhydrous so high-temperature or dry
conditions favor pyroxenes over amphiboles
35. The pyroxene quadrilateral and opx-cpx solvus
Coexisting opx + cpx in many rocks (pigeonite only in volcanics)
Diopside Hedenbergite
Wollastonite
Enstatite Ferrosilite
orthopyroxenes
clinopyroxenes
pigeonite (Mg,Fe)2Si2O6 Ca(Mg,Fe)Si2O6
pigeonite
orthopyroxenes
Solvus
1200oC
1000oC
800oC
37. Pyroxenoids“Ideal” pyroxene chains with
5.2 A repeat (2 tetrahedra)
become distorted as other
cations occupy VI sites
Wollastonite
(Ca M1)
3-tet repeat
Rhodonite
MnSiO3
5-tet repeat
Pyroxmangite
(Mn, Fe)SiO3
7-tet repeat
Pyroxene
2-tet repeat
7.1 A
12.5 A
17.4 A
5.2 A
38. Inosilicates: double chains- amphiboles
Tremolite (001) view blue = Si purple = M1 rose = M2 gray = M3 (all Mg)
yellow = M4 (Ca)
Tremolite:
Ca2Mg5 [Si8O22] (OH)2
b
asin
39. Inosilicates: double chains- amphiboles
Hornblende:
(Ca, Na)2-3 (Mg, Fe, Al)5
[(Si,Al)8O22] (OH)2
b
asin
Hornblende (001) view dark blue = Si, Al purple = M1 rose = M2
light blue = M3 (all Mg, Fe) yellow ball = M4 (Ca) purple ball = A (Na)
little turquoise ball = H
40. Inosilicates: double chains- amphiboles
Hornblende (001) view dark blue = Si, Al purple = M1 rose = M2
light blue = M3 (all Mg, Fe)
Hornblende:
(Ca, Na)2-3 (Mg, Fe,
Al)5 [(Si,Al)8O22]
(OH)2
Same I-beam
architecture, but
the I-beams are
fatter (double
chains)
41. Inosilicates: double chains- amphiboles
b
asin
(+) (+)
(+)
(+)
(+)
Same I-beam
architecture, but
the I-beams are
fatter (double
chains)
All are (+) on
clinoamphiboles
and alternate in
orthoamphiboles
Hornblende (001) view dark blue = Si, Al purple = M1 rose = M2
light blue = M3 (all Mg, Fe) yellow ball = M4 (Ca) purple ball = A (Na)
little turquoise ball = H
Hornblende:
(Ca, Na)2-3 (Mg, Fe,
Al)5 [(Si,Al)8O22]
(OH)2
42. Inosilicates: double chains- amphiboles
Hornblende (001) view dark blue = Si, Al purple = M1 rose = M2
light blue = M3 (all Mg, Fe) yellow ball = M4 (Ca) purple ball = A (Na)
little turquoise ball = H
Hornblende:
(Ca, Na)2-3 (Mg, Fe, Al)5
[(Si,Al)8O22] (OH)2
M1-M3 are small sites
M4 is larger (Ca)
A-site is really big
Variety of sites
great chemical range
43. Inosilicates: double chains- amphiboles
Hornblende (001) view dark blue = Si, Al purple = M1 rose = M2
light blue = M3 (all Mg, Fe) yellow ball = M4 (Ca) purple ball = A (Na)
little turquoise ball = H
Hornblende:
(Ca, Na)2-3 (Mg, Fe, Al)5
[(Si,Al)8O22] (OH)2
(OH) is in center of
tetrahedral ring where O
is a part of M1 and M3
octahedra
(OH)
44. See handout for more information
General formula:
W0-1 X2 Y5 [Z8O22] (OH, F, Cl)2
W = Na K
X = Ca Na Mg Fe2+ (Mn Li)
Y = Mg Fe2+ Mn Al Fe3+ Ti
Z = Si Al
Again, the great variety of sites and sizes a great chemical range, and
hence a broad stability range
The hydrous nature implies an upper temperature stability limit
Amphibole Chemistry
45. Ca-Mg-Fe Amphibole “quadrilateral” (good analogy with pyroxenes)
Amphibole Chemistry
Al and Na tend to stabilize the orthorhombic form in low-Ca amphiboles, so anthophyllite
gedrite orthorhombic series extends to Fe-rich gedrite in more Na-Al-rich compositions
Tremolite
Ca2Mg5Si8O22(OH)2
Ferroactinolite
Ca2Fe5Si8O22(OH)2
Anthophyllite
Mg7Si8O22(OH)2
Fe7Si8O22(OH)2
Actinolite
Cummingtonite-grunerite
Orthoamphiboles
Clinoamphiboles
46. Hornblende has Al in the tetrahedral site
Geologists traditionally use the term “hornblende” as a catch-all term for practically
any dark amphibole. Now the common use of the microprobe has petrologists
casting “hornblende” into end-member compositions and naming amphiboles
after a well-represented end-member.
Sodic amphiboles
Glaucophane: Na2 Mg3 Al2 [Si8O22] (OH)2
Riebeckite: Na2 Fe2+
3 Fe3+
2 [Si8O22] (OH)2
Sodic amphiboles are commonly blue, and often called “blue amphiboles”
Amphibole Chemistry
47. Tremolite (Ca-Mg) occurs in meta-carbonates
Actinolite occurs in low-grade metamorphosed basic igneous rocks
Orthoamphiboles and cummingtonite-grunerite (all Ca-free, Mg-Fe-rich
amphiboles) are metamorphic and occur in meta-ultrabasic rocks and some
meta-sediments. The Fe-rich grunerite occurs in meta-ironstones
The complex solid solution called hornblende occurs in a broad variety of both
igenous and metamorphic rocks
Sodic amphiboles are predominantly metamorphic where they are
characteristic of high P/T subduction-zone metamorphism (commonly called
“blueschist” in reference to the predominant blue sodic amphiboles
Riebeckite occurs commonly in sodic granitoid rocks
Amphibole Occurrences
48. Inosilicates
Pyroxenes and amphiboles are very similar:
Both have chains of SiO4 tetrahedra
The chains are connected into stylized I-beams by M octahedra
High-Ca monoclinic forms have all the T-O-T offsets in the same direction
Low-Ca orthorhombic forms have alternating (+) and (-) offsets
+
+ +
+
++
+
++
-
- -
-
-
-
+
++
a
a
+
+ +
+
+ +
+
+ +
+
+ +
-
-
-
-
-
-
Clinopyroxene
Orthopyroxene Orthoamphibole
Clinoamphibole
49. Inosilicates
Cleavage angles can be interpreted in terms of weak bonds in M2 sites
(around I-beams instead of through them)
Narrow single-chain I-beams 90o cleavages in pyroxenes while wider double-
chain I-beams 60-120o cleavages in amphiboles
pyroxene amphibole
a
b
50. SiO4 tetrahedra polymerized into 2-D sheets: [Si2O5]
Apical O’s are unpolymerized and are bonded to other constituents
Phyllosilicates
51. Tetrahedral layers are bonded to octahedral layers
(OH) pairs are located in center of T rings where no apical O
Phyllosilicates
52. Octahedral layers can be understood by analogy with hydroxides
Phyllosilicates
Brucite: Mg(OH)2
Layers of octahedral Mg in
coordination with (OH)
Large spacing along c due
to weak van der waals
bonds
c
53. Phyllosilicates
Gibbsite: Al(OH)3
Layers of octahedral Al in coordination with (OH)
Al3+ means that only 2/3 of the VI sites may be occupied for charge-balance reasons
Brucite-type layers may be called trioctahedral and gibbsite-type dioctahedral
a1
a2
54. Phyllosilicates
Kaolinite: Al2 [Si2O5] (OH)4
T-layers and diocathedral (Al3+) layers
(OH) at center of T-rings and fill base of VI layer
Yellow = (OH)
T
O
-
T
O
-
T
O
vdw
vdw
weak van der Waals bonds between T-O groups
55. Phyllosilicates
Serpentine: Mg3 [Si2O5] (OH)4
T-layers and triocathedral (Mg2+) layers
(OH) at center of T-rings and fill base of VI layer
Yellow = (OH)
T
O
-
T
O
-
T
O
vdw
vdw
weak van der Waals bonds between T-O groups
56. Serpentine
Octahedra are a bit larger than tetrahedral
match, so they cause bending of the T-O
layers (after Klein and Hurlbut, 1999).
Antigorite maintains a
sheet-like form by
alternating segments of
opposite curvature
Chrysotile does not do this
and tends to roll into tubes
57. Serpentine
The rolled tubes in chrysotile resolves the apparent
paradox of asbestosform sheet silicates
S = serpentine T = talc
Nagby and Faust (1956) Am.
Mineralogist 41, 817-836.
Veblen and Busek, 1979,
Science 206, 1398-1400.
58. Phyllosilicates
Pyrophyllite: Al2 [Si4O10] (OH)2
T-layer - diocathedral (Al3+) layer - T-layer
T
O
T
-
T
O
T
-
T
O
T
vdw
vdw
weak van der Waals bonds between T - O - T groups
Yellow = (OH)
59. Phyllosilicates
Talc: Mg3 [Si4O10] (OH)2
T-layer - triocathedral (Mg2+) layer - T-layer
T
O
T
-
T
O
T
-
T
O
T
vdw
vdw
weak van der Waals bonds between T - O - T groups
Yellow = (OH)
60. Phyllosilicates
Muscovite: K Al2 [Si3AlO10] (OH)2 (coupled K - AlIV)
T-layer - diocathedral (Al3+) layer - T-layer - K
T
O
T
K
T
O
T
K
T
O
T
K between T - O - T groups is stronger than vdw
61. Phyllosilicates
Phlogopite: K Mg3 [Si3AlO10] (OH)2
T-layer - triocathedral (Mg2+) layer - T-layer - K
T
O
T
K
T
O
T
K
T
O
T
K between T - O - T groups is stronger than vdw
63. Chlorite: (Mg, Fe)3 [(Si, Al)4O10] (OH)2 (Mg, Fe)3 (OH)6
= T - O - T - (brucite) - T - O - T - (brucite) - T - O - T -
Very hydrated (OH)8, so low-temperature stability (low-T metamorphism
and alteration of mafics as cool)
Phyllosilicates
64. Why are there single-chain-, double-chain-, and sheet-polymer types,
and not triple chains, quadruple chains, etc??
“Biopyriboles”