The document summarizes several major clay minerals including kaolinite, illite, and smectites. It then discusses the structures of phyllosilicates including their tetrahedral and octahedral layers. Specific examples of kaolinite, serpentine, and 2:1 clays are provided. The document also briefly discusses carbonate minerals of the calcite, dolomite, and aragonite groups. Finally, it summarizes common sulfate minerals like gypsum, halide minerals such as halite, and oxide minerals including iron oxides.
This document provides information about common rock-forming minerals. It discusses the composition, properties and occurrence of silicate minerals like quartz, feldspar, mica, amphibole and pyroxene. It also covers the carbonate mineral calcite and the silicate mineral olivine. These minerals are important components of igneous, metamorphic and sedimentary rocks.
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This document provides information on minerals, rocks, and their properties. It defines minerals as naturally occurring solid materials with a defined chemical composition and internal structure. The most common elements in Earth's crust are oxygen, silicon, aluminum, iron, calcium, sodium, and potassium. Minerals are divided into silicate and non-silicate groups. Key silicate minerals include quartz, feldspar, mica, amphibole, pyroxene, olivine, and garnet. Non-silicates include carbonates, oxides, sulfides, phosphates, and native elements. Physical properties used to identify minerals include color, streak, luster, hardness, crystal shape, cleavage, fracture, and specific
Minerals are naturally occurring inorganic solids that have a definite chemical composition and crystal structure. They form through geological processes such as cooling of magma or crystallization of dissolved materials. Minerals are identified based on properties like color, crystal structure, hardness, and density. They have many important economic uses in construction, technology, and everyday products.
Minerals are naturally occurring inorganic solids that have a definite chemical composition and crystal structure. They form through geological processes such as cooling of magma or crystallization of dissolved materials. Minerals are identified based on properties like color, crystal structure, hardness, and chemical makeup. The main minerals in Earth's crust include oxygen, silicon, aluminum, and iron.
This document provides a summary of the contents of a lecture on minerals. It discusses the definition of a mineral, classification of minerals into rock-forming and ore-forming groups. It also describes various mineral properties that can be used for identification such as color, streak, hardness, cleavage, luster, and explains systems for classifying minerals based on these properties. Common rock-forming minerals and their characteristics are also outlined.
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.
This document provides information about common rock-forming minerals. It discusses the composition, properties and occurrence of silicate minerals like quartz, feldspar, mica, amphibole and pyroxene. It also covers the carbonate mineral calcite and the silicate mineral olivine. These minerals are important components of igneous, metamorphic and sedimentary rocks.
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This document provides information on minerals, rocks, and their properties. It defines minerals as naturally occurring solid materials with a defined chemical composition and internal structure. The most common elements in Earth's crust are oxygen, silicon, aluminum, iron, calcium, sodium, and potassium. Minerals are divided into silicate and non-silicate groups. Key silicate minerals include quartz, feldspar, mica, amphibole, pyroxene, olivine, and garnet. Non-silicates include carbonates, oxides, sulfides, phosphates, and native elements. Physical properties used to identify minerals include color, streak, luster, hardness, crystal shape, cleavage, fracture, and specific
Minerals are naturally occurring inorganic solids that have a definite chemical composition and crystal structure. They form through geological processes such as cooling of magma or crystallization of dissolved materials. Minerals are identified based on properties like color, crystal structure, hardness, and density. They have many important economic uses in construction, technology, and everyday products.
Minerals are naturally occurring inorganic solids that have a definite chemical composition and crystal structure. They form through geological processes such as cooling of magma or crystallization of dissolved materials. Minerals are identified based on properties like color, crystal structure, hardness, and chemical makeup. The main minerals in Earth's crust include oxygen, silicon, aluminum, and iron.
This document provides a summary of the contents of a lecture on minerals. It discusses the definition of a mineral, classification of minerals into rock-forming and ore-forming groups. It also describes various mineral properties that can be used for identification such as color, streak, hardness, cleavage, luster, and explains systems for classifying minerals based on these properties. Common rock-forming minerals and their characteristics are also outlined.
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.
1. The document discusses the extraction of metals from their ores. It describes the natural occurrence of metal ores, the concentration and purification processes, and specific methods for extracting tin, copper, and aluminum.
2. Key concentration methods mentioned include magnetic separation, froth flotation, and leaching. Thermal and electrolytic reduction are discussed as the main reduction techniques.
3. Tin is mainly extracted from the ore cassiterite, copper from copper pyrite and malachite/azurite, and aluminum from bauxite via the Bayer process.
Minerals and rocks can be identified by their physical and chemical properties. A mineral has definite properties including being naturally occurring, inorganic, solid, having a definite chemical composition and crystal structure. There are several types of rocks including sedimentary, igneous, and metamorphic rocks which are classified based on their formation. Sedimentary rocks form from the accumulation and cementation of sediments and can be clastic, chemical, or organic. Igneous rocks form from the cooling of magma and include extrusive volcanic and intrusive plutonic rocks. Metamorphic rocks form from the alteration of existing rocks through heat, pressure, and chemical changes in the Earth's crust.
Minerals and rocks can be identified based on their physical and chemical properties. A mineral is defined as a naturally occurring, inorganic solid with a definite chemical composition and crystal structure. Minerals may form from the cooling of lava or magma, or from chemical or physical changes to existing rocks. Rocks are composed of one or more minerals and can be classified as sedimentary, igneous, or metamorphic based on their formation process. The identification of a material as a mineral or rock involves testing its properties, such as hardness, crystal structure, or chemical reactivity.
The document discusses how metals occur in nature and the processes involved in extracting metals from ores. It makes the following key points:
1. Metals occur naturally in either a native state or combined state, depending on their chemical reactivity. The major steps to extract metals from ores include crushing, grinding, concentrating the ore, converting it to an oxide, extracting the crude metal, and refining the metal.
2. Concentrating the ore involves removing gangue and involves processes like magnetic separation, froth flotation, and electrostatic separation which separate materials based on differences in their physical properties.
3. Extractive metallurgy is the scientific process used to isolate metals from ores through various physical
1) Ores form through geological processes that concentrate elements and minerals within rocks.
2) Common concentration mechanisms include weathering and erosion, precipitation from aqueous fluids, liquid immiscibility in magmas, and oxidation/reduction reactions in groundwater.
3) These processes remove elements from source rocks, transport them through fluids like water or magma, and re-deposit them in concentrated forms in favorable locations, creating economically viable ore deposits.
This document discusses various methods used to extract metals from their ores, including concentration, roasting/calcination, reduction, and refining. It describes several concentration methods like magnetic separation, hydraulic washing, and froth floatation to separate ores from gangue. Leaching is also discussed as a chemical separation process used to extract metals like aluminum, gold, silver, and low-grade copper ores. Overall, the document provides an overview of key terms and processes involved in the metallurgy of extracting pure metals from raw mineral ores.
This document provides an overview of minerals, their composition and structure. It discusses that minerals are naturally occurring inorganic solids with definite chemical compositions and ordered internal structures. It describes the basic building blocks of minerals including elements, atoms, and different types of chemical bonding. It also summarizes the different physical properties used to identify minerals such as crystal form, luster, color, cleavage, fracture and hardness. Finally, it outlines some of the major mineral groups found in Earth's crust including silicates, carbonates, oxides, sulfides and others.
SHB337~1.Powerpoint prsentation in ELSSScjoypingaron
Minerals are naturally occurring solid substances with a crystalline structure. They are formed through natural geological processes and are not living or once living. All minerals share the properties of having a definite shape and volume, being made up of unique chemical compounds or elements, and having particles arranged in repeating crystalline patterns. Minerals are grouped based on their chemical composition, with the largest group being silicates that contain silicon and oxygen. Other common mineral groups include non-silicates, carbonates, oxides, sulfides, sulfates, and native elements. Minerals form through the cooling of magma or the recrystallization of dissolved elements in water. Their properties like color, luster, hardness, cleavage/fracture
- Silicates are the most abundant class of minerals, comprising 40% of all common minerals. They are the essential and accessory minerals of most igneous and sedimentary rocks.
- Silicates are classified into subclasses based on the degree of polymerization of the silicon tetrahedron building blocks. The main subclasses are nesosilicates, sorosilicates, cyclosilicates, inosilicates, phyllosilicates, and tectosilicates.
- Important rock-forming silicate minerals include olivine, pyroxenes, amphiboles, micas, clays, and feldspars. Many silicates also have
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 different types of silicate structures that make up the majority of the Earth's crust. There are 6 main silicate structures - nesosilicates, sorosilicates, cyclosilicates, inosilicates, phyllosilicates, and tectosilicates - which differ based on how the basic silica tetrahedra (SiO4) units are bonded together. Examples are given of common minerals that exemplify each structure type, including olivine as a nesosilicate and quartz as a tectosilicate. A quiz with 10 multiple choice and fill-in-the-blank questions is also provided to
The document summarizes the extraction and properties of metals, non-metals, and noble gases. It discusses that metals are usually extracted via electrolytic reduction or reduction using carbon or carbon monoxide depending on their reactivity. Extraction involves concentrating the ore, reducing the metal from its oxide form, and sometimes refining to purify the metal. Non-metals tend to gain or share electrons and form acidic or neutral oxides. They are extracted from compounds in nature and bromine extraction from sea water is discussed as an example. Noble gases are separated from liquefied air using fractional distillation based on their boiling points.
This document provides information about minerals and rocks. It defines a mineral as a naturally occurring, inorganic solid with a definite chemical composition and crystal structure. It describes the different types of rocks, including sedimentary rocks which form from the accumulation of sediments, igneous rocks which form from the cooling of magma, and metamorphic rocks which form from the alteration of existing rocks due to heat and pressure. The document also discusses the physical and chemical properties used to identify minerals, as well as how minerals are used and the relationship between minerals and rocks.
The document discusses minerals, their properties, and how they are classified. It defines minerals as naturally occurring solid substances with a crystal structure. All minerals share common characteristics - they form through natural processes, are not living, have a definite shape and volume, and are made of elements or compounds arranged in repeating crystal patterns. Minerals are grouped based on their chemical composition, with the most abundant group being silicates like quartz and mica. Physical properties like color, luster, hardness, cleavage/fracture, and specific gravity can be used to identify different minerals.
The document discusses the process of extracting metals from ores. It explains that ores rarely contain only the desired metal and usually include unwanted materials called gangue. The extraction process involves three main steps - concentrating the ore, isolating the metal from the concentrated ore, and purifying the metal. It describes various concentration techniques used depending on the properties of the ore, including hydraulic washing, magnetic separation, and froth floatation. Leaching is also used to extract some metals by dissolving them in solvents like sodium cyanide solutions. The entire scientific process of extracting metals from ores is called metallurgy.
This document discusses the potential resources available from near-Earth asteroids, including their composition and location. It notes that asteroids contain valuable metals like nickel, platinum and gold, as well as rocks, ice and volatiles. The document outlines different categories of asteroids based on their composition and orbit. It proposes using small robotic probes and solar furnaces to mine and process asteroid materials with minimal human presence required for setup and repairs.
Microcline is an important igneous rock-forming potassium feldspar mineral. Biotite is an iron-rich sheet silicate mineral that forms weakly bound sheets. Calcite is the most stable polymorph of calcium carbonate and commonly forms trigonal-rhombohedral crystals. Fluorite is a colorful mineral composed of calcium fluoride that is used for ornamental purposes and in industrial applications such as smelting fluxes.
This presentation was provided by Steph Pollock of The American Psychological Association’s Journals Program, and Damita Snow, of The American Society of Civil Engineers (ASCE), for the initial session of NISO's 2024 Training Series "DEIA in the Scholarly Landscape." Session One: 'Setting Expectations: a DEIA Primer,' was held June 6, 2024.
1. The document discusses the extraction of metals from their ores. It describes the natural occurrence of metal ores, the concentration and purification processes, and specific methods for extracting tin, copper, and aluminum.
2. Key concentration methods mentioned include magnetic separation, froth flotation, and leaching. Thermal and electrolytic reduction are discussed as the main reduction techniques.
3. Tin is mainly extracted from the ore cassiterite, copper from copper pyrite and malachite/azurite, and aluminum from bauxite via the Bayer process.
Minerals and rocks can be identified by their physical and chemical properties. A mineral has definite properties including being naturally occurring, inorganic, solid, having a definite chemical composition and crystal structure. There are several types of rocks including sedimentary, igneous, and metamorphic rocks which are classified based on their formation. Sedimentary rocks form from the accumulation and cementation of sediments and can be clastic, chemical, or organic. Igneous rocks form from the cooling of magma and include extrusive volcanic and intrusive plutonic rocks. Metamorphic rocks form from the alteration of existing rocks through heat, pressure, and chemical changes in the Earth's crust.
Minerals and rocks can be identified based on their physical and chemical properties. A mineral is defined as a naturally occurring, inorganic solid with a definite chemical composition and crystal structure. Minerals may form from the cooling of lava or magma, or from chemical or physical changes to existing rocks. Rocks are composed of one or more minerals and can be classified as sedimentary, igneous, or metamorphic based on their formation process. The identification of a material as a mineral or rock involves testing its properties, such as hardness, crystal structure, or chemical reactivity.
The document discusses how metals occur in nature and the processes involved in extracting metals from ores. It makes the following key points:
1. Metals occur naturally in either a native state or combined state, depending on their chemical reactivity. The major steps to extract metals from ores include crushing, grinding, concentrating the ore, converting it to an oxide, extracting the crude metal, and refining the metal.
2. Concentrating the ore involves removing gangue and involves processes like magnetic separation, froth flotation, and electrostatic separation which separate materials based on differences in their physical properties.
3. Extractive metallurgy is the scientific process used to isolate metals from ores through various physical
1) Ores form through geological processes that concentrate elements and minerals within rocks.
2) Common concentration mechanisms include weathering and erosion, precipitation from aqueous fluids, liquid immiscibility in magmas, and oxidation/reduction reactions in groundwater.
3) These processes remove elements from source rocks, transport them through fluids like water or magma, and re-deposit them in concentrated forms in favorable locations, creating economically viable ore deposits.
This document discusses various methods used to extract metals from their ores, including concentration, roasting/calcination, reduction, and refining. It describes several concentration methods like magnetic separation, hydraulic washing, and froth floatation to separate ores from gangue. Leaching is also discussed as a chemical separation process used to extract metals like aluminum, gold, silver, and low-grade copper ores. Overall, the document provides an overview of key terms and processes involved in the metallurgy of extracting pure metals from raw mineral ores.
This document provides an overview of minerals, their composition and structure. It discusses that minerals are naturally occurring inorganic solids with definite chemical compositions and ordered internal structures. It describes the basic building blocks of minerals including elements, atoms, and different types of chemical bonding. It also summarizes the different physical properties used to identify minerals such as crystal form, luster, color, cleavage, fracture and hardness. Finally, it outlines some of the major mineral groups found in Earth's crust including silicates, carbonates, oxides, sulfides and others.
SHB337~1.Powerpoint prsentation in ELSSScjoypingaron
Minerals are naturally occurring solid substances with a crystalline structure. They are formed through natural geological processes and are not living or once living. All minerals share the properties of having a definite shape and volume, being made up of unique chemical compounds or elements, and having particles arranged in repeating crystalline patterns. Minerals are grouped based on their chemical composition, with the largest group being silicates that contain silicon and oxygen. Other common mineral groups include non-silicates, carbonates, oxides, sulfides, sulfates, and native elements. Minerals form through the cooling of magma or the recrystallization of dissolved elements in water. Their properties like color, luster, hardness, cleavage/fracture
- Silicates are the most abundant class of minerals, comprising 40% of all common minerals. They are the essential and accessory minerals of most igneous and sedimentary rocks.
- Silicates are classified into subclasses based on the degree of polymerization of the silicon tetrahedron building blocks. The main subclasses are nesosilicates, sorosilicates, cyclosilicates, inosilicates, phyllosilicates, and tectosilicates.
- Important rock-forming silicate minerals include olivine, pyroxenes, amphiboles, micas, clays, and feldspars. Many silicates also have
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 different types of silicate structures that make up the majority of the Earth's crust. There are 6 main silicate structures - nesosilicates, sorosilicates, cyclosilicates, inosilicates, phyllosilicates, and tectosilicates - which differ based on how the basic silica tetrahedra (SiO4) units are bonded together. Examples are given of common minerals that exemplify each structure type, including olivine as a nesosilicate and quartz as a tectosilicate. A quiz with 10 multiple choice and fill-in-the-blank questions is also provided to
The document summarizes the extraction and properties of metals, non-metals, and noble gases. It discusses that metals are usually extracted via electrolytic reduction or reduction using carbon or carbon monoxide depending on their reactivity. Extraction involves concentrating the ore, reducing the metal from its oxide form, and sometimes refining to purify the metal. Non-metals tend to gain or share electrons and form acidic or neutral oxides. They are extracted from compounds in nature and bromine extraction from sea water is discussed as an example. Noble gases are separated from liquefied air using fractional distillation based on their boiling points.
This document provides information about minerals and rocks. It defines a mineral as a naturally occurring, inorganic solid with a definite chemical composition and crystal structure. It describes the different types of rocks, including sedimentary rocks which form from the accumulation of sediments, igneous rocks which form from the cooling of magma, and metamorphic rocks which form from the alteration of existing rocks due to heat and pressure. The document also discusses the physical and chemical properties used to identify minerals, as well as how minerals are used and the relationship between minerals and rocks.
The document discusses minerals, their properties, and how they are classified. It defines minerals as naturally occurring solid substances with a crystal structure. All minerals share common characteristics - they form through natural processes, are not living, have a definite shape and volume, and are made of elements or compounds arranged in repeating crystal patterns. Minerals are grouped based on their chemical composition, with the most abundant group being silicates like quartz and mica. Physical properties like color, luster, hardness, cleavage/fracture, and specific gravity can be used to identify different minerals.
The document discusses the process of extracting metals from ores. It explains that ores rarely contain only the desired metal and usually include unwanted materials called gangue. The extraction process involves three main steps - concentrating the ore, isolating the metal from the concentrated ore, and purifying the metal. It describes various concentration techniques used depending on the properties of the ore, including hydraulic washing, magnetic separation, and froth floatation. Leaching is also used to extract some metals by dissolving them in solvents like sodium cyanide solutions. The entire scientific process of extracting metals from ores is called metallurgy.
This document discusses the potential resources available from near-Earth asteroids, including their composition and location. It notes that asteroids contain valuable metals like nickel, platinum and gold, as well as rocks, ice and volatiles. The document outlines different categories of asteroids based on their composition and orbit. It proposes using small robotic probes and solar furnaces to mine and process asteroid materials with minimal human presence required for setup and repairs.
Microcline is an important igneous rock-forming potassium feldspar mineral. Biotite is an iron-rich sheet silicate mineral that forms weakly bound sheets. Calcite is the most stable polymorph of calcium carbonate and commonly forms trigonal-rhombohedral crystals. Fluorite is a colorful mineral composed of calcium fluoride that is used for ornamental purposes and in industrial applications such as smelting fluxes.
This presentation was provided by Steph Pollock of The American Psychological Association’s Journals Program, and Damita Snow, of The American Society of Civil Engineers (ASCE), for the initial session of NISO's 2024 Training Series "DEIA in the Scholarly Landscape." Session One: 'Setting Expectations: a DEIA Primer,' was held June 6, 2024.
Main Java[All of the Base Concepts}.docxadhitya5119
This is part 1 of my Java Learning Journey. This Contains Custom methods, classes, constructors, packages, multithreading , try- catch block, finally block and more.
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.
Strategies for Effective Upskilling is a presentation by Chinwendu Peace in a Your Skill Boost Masterclass organisation by the Excellence Foundation for South Sudan on 08th and 09th June 2024 from 1 PM to 3 PM on each day.
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How to Setup Warehouse & Location in Odoo 17 InventoryCeline George
In this slide, we'll explore how to set up warehouses and locations in Odoo 17 Inventory. This will help us manage our stock effectively, track inventory levels, and streamline warehouse operations.
The simplified electron and muon model, Oscillating Spacetime: The Foundation...RitikBhardwaj56
Discover the Simplified Electron and Muon Model: A New Wave-Based Approach to Understanding Particles delves into a groundbreaking theory that presents electrons and muons as rotating soliton waves within oscillating spacetime. Geared towards students, researchers, and science buffs, this book breaks down complex ideas into simple explanations. It covers topics such as electron waves, temporal dynamics, and the implications of this model on particle physics. With clear illustrations and easy-to-follow explanations, readers will gain a new outlook on the universe's fundamental nature.
This presentation includes basic of PCOS their pathology and treatment and also Ayurveda correlation of PCOS and Ayurvedic line of treatment mentioned in classics.
Executive Directors Chat Leveraging AI for Diversity, Equity, and InclusionTechSoup
Let’s explore the intersection of technology and equity in the final session of our DEI series. Discover how AI tools, like ChatGPT, can be used to support and enhance your nonprofit's DEI initiatives. Participants will gain insights into practical AI applications and get tips for leveraging technology to advance their DEI goals.
How to Add Chatter in the odoo 17 ERP ModuleCeline George
In Odoo, the chatter is like a chat tool that helps you work together on records. You can leave notes and track things, making it easier to talk with your team and partners. Inside chatter, all communication history, activity, and changes will be displayed.
it describes the bony anatomy including the femoral head , acetabulum, labrum . also discusses the capsule , ligaments . muscle that act on the hip joint and the range of motion are outlined. factors affecting hip joint stability and weight transmission through the joint are summarized.
Exploiting Artificial Intelligence for Empowering Researchers and Faculty, In...Dr. Vinod Kumar Kanvaria
Exploiting Artificial Intelligence for Empowering Researchers and Faculty,
International FDP on Fundamentals of Research in Social Sciences
at Integral University, Lucknow, 06.06.2024
By Dr. Vinod Kumar Kanvaria
1. Major Clay Minerals
• Kaolinite – Al2Si2O5(OH)4
• Illite – K1-1.5Al4(Si,Al)8O20(OH)4
• Smectites:
– Montmorillonite – (Ca, Na)0.2-
0.4(Al,Mg,Fe)2(Si,Al)4O10(OH)2*nH2O
– Vermicullite - (Ca, Mg)0.3-
0.4(Al,Mg,Fe)3(Si,Al)4O10(OH)2*nH2O
– Swelling clays – can take up extra water in their
interlayers and are the major components of
bentonite (NOT a mineral, but a mix of different
clay minerals)
2. SiO4 tetrahedra polymerized into 2-D sheets: [Si2O5]
Apical O’s are unpolymerized and are bonded to other
constituents
Phyllosilicates
3. Tetrahedral layers are bonded to octahedral layers
(OH) pairs are located in center of T rings where no
apical O
Phyllosilicates
4. 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
5. 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
6.
7. 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
8. 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
9. Clay building blocks
• Kaolinite micelles attached with
H bonds – many H bonds
aggregately strong, do not
expend or swell
1:1 Clay
10. Clay building blocks
2:1 Clay
• Slightly different way to deal
with charge on the
octahedral layer – put an
opposite tetrahedral sheet on
it…
• Now, how can we put these
building blocks together…
11. Calcite vs. Dolomite
• dolomite less reactive with HCl calcite has
lower indices of refraction
• calcite more commonly twinned
• dolomite more commonly euhedral
• calcite commonly colourless
• dolomite may be cloudy or stained by iron
oxide
• Mg spectroscopic techniques!
• Different symmetry cleavage same, but
easily distinguished by XRD
12. Calcite Group
• Variety of minerals varying
by cation
• Ca Calcite
• Fe Siderite
• Mn Rhodochrosite
• Zn Smithsonite
• Mg Magnesite
13. Dolomite Group
• Similar structure to calcite,
but Ca ions are in
alternating layers from Mg,
Fe, Mn, Zn
• Ca(Mg, Fe, Mn, Zn)(CO3)2
– Ca Dolomite
– Fe Ankerite
– Mn Kutnahorite
14. Aragonite Group
• Polymorph of calcite, but the structure can
incorporate some other, larger, metals more
easily (Pb, Ba, Sr)
– Ca Aragonite
– Pb cerrusite
– Sr Strontianite
– Ba Witherite
• Aragonite LESS stable than calcite, but
common in biological material (shells….)
15. Carbonate Minerals
Calcite Group
(hexagonal)
Dolomite Group
(hexagonal)
AragoniteGroup
(orthorhombic)
mineral formula mineral formula mineral formula
Calcite CaCO3 Dolomite CaMg(CO3)2 Aragonite CaCO3
Magnesite MgCO3 Ankerite
Ca(Mg,Fe)(
CO3)2
Witherite BaCO3
Siderite, FeCO3 Kutnohorite CaMn(CO3)2 Strontianite SrCO3
Rhodochros
ite
MnCO3
17. Sulfate Minerals
• More than 100 different minerals,
separated into hydrous (with H2O) or
anhydrous (without H2O) groups
• Gypsum (CaSO4*2H2O) and anhydrite
(CaSO4) are the most common of the
sulfate minerals
• Gypsum typically forms in evaporitic basins
– a polymorph of anhydrite (g-CaSO4)
forms when the gypsum is later
dehydrated)
19. • Gypsum formation
can demarcate
ancient seas that
dried up (such as
the inland seas of
the Michigan basin)
or tell us about the
history of current
seas which have
dried up before
(such as the
Mediterranean Sea)
20. Halide Minerals
• Minerals contianing halogen elements as
dominant anion (Cl- or F- typically)
• Halite (NaCl) and Sylvite (KCl) form in VERY
concentrated evaporitic waters – they are
extremely soluble in water, indicate more
complete evaporation than does gypsum
• Fluorite (CaF2) more typically occurs in veins
associated with hydrothermal waters (F- in
hydrothermal solutions is typically much higher –
leached out of parent minerals such as biotites,
pyroxenes, hornblendes or apatite)
21. Halite Structure
• NaCl Na+ (gray)
arranged in CCP
with Cl- (red) at
edges and center (in
octahedral cavities)
23. Sulfate Minerals II
• Barite (BaSO4), Celestite (SrSO4), and Anglesite
(PbSO4) are also important in mining.
• These minerals are DENSE Barite =4.5, Anglesite
= 6.3 (feldspars are ~2.5)
24. Barite, Celestite, Anglesite
• Metals bond with sulfate much more
easily, and thus are generally more
insoluble – they do not require formation in
evaporitic basins
• What do they indicate then?
Ba, Pb, Sr – very low SO4
2- Lots of SO4
2-
Not very much Ba, Sr, Pb
25. Just silica…
• Chert – extremely fine grained quartz
– Forms as nodules in limestone, recrystallization of siliceous fossils
– Jasper – variety with hematite inclusions red
– Flint – variety containing organic matter darker color
• Chalcedony – microcrystaliine silica (very similar to low
quartz, but different – it is yet uncertain how different…)
typically shows banding, often colored to form an agate (rock
formed of multiple bands of colored chalcedony)
• Jasper – variety colored with inclusion of microcrystsalline
oxides (often iron oxides = red)
• Opal – a hydrogel (a solid solution of water in silica) – forms
initially as water + silica colloids, then slowly the water
diffuses into the silica making it amorphous (no XRD
pattern!)
– Some evidence opal slowly recrystallizes to chalcedony
28. Oxides - Oxyhydroxides
• FeOOH minerals Goethite or Limonite (FeOOH)
important alteration products of weathering Fe-bearing
minerals
• Hematite (Fe2O3) primary iron oxide in Banded Iron
Formations
• Boehmite (AlOOH) primary mineral in bauxite ores
(principle Al ore) which forms in tropical soils
• Mn oxides form Mn nodules in the oceans (estimated
they cover 10-30% of the deep Pacific floor)
• Many other oxides important in metamorphic rocks…
29.
30. Mn oxides - oxyhydroxides
• Mn exists as 2+, 3+, and 4+; oxide minerals are
varied, complex, and hard to ID
– ‘Wad’ soft (i.e. blackens your fingers), brown-black
fine-grained Mn oxides
– ‘Psilomelane’ hard (does not blacked fingers) gray-
black botroyoidal, massive Mn oxides
• XRD analyses do not easily distinguish different
minerals, must combine with TEM, SEM, IR
spectroscopy, and microprobe work
32. Iron Oxides
• Interaction of dissolved iron with oxygen
yields iron oxide and iron oxyhyroxide
minerals
• 1st thing precipitated amorphous or
extremely fine grained (nanocrystaliine) iron
oxides called ferrihydrite
Fe2+ O2
34. Goethite
• Ferrihydrite recrystallizes into Goethite (a-
FeOOH)
• There are other polymorphs of iron
oxyhydroxides:
– Lepidocrocite g-FeOOH
– Akaganeite b-FeOOH
35. Iron Oxides
• Hematite (Fe2O3) – can form directly or via
ferrihydrite goethite hematite
• Red-brown mineral is very common in soils and
weathering iron-bearing rocks
36. • Magnetite (Fe3O4) – Magnetic mineral of
mixed valence must contain both Fe2+
and Fe3+ how many of each??
• ‘Spinel’ structure – 2/3 of the cation sites
are octahedral, 1/3 are tetrahedral
37. Banded Iron Formations (BIFs)
• HUGE PreCambrian
formations composed of
hematite-jasper-chalcedony
bands
• Account for ~90% of the
world’s iron supply
• Occur only between 1.9 and
3.8 Ga many sites around
the world Hammersley in
Australia, Ishpeming in
Michigan, Isua in Greenland,
Carajas in Brazil, many other
sites around the world…