3. OBJECTIVES
1. Compare and contrast the formation of different
types of igneous rocks
2. Distinguish intrusive from extrusive igneous
rocks
3. Differentiate igneous rocks based on silica
content
4. Differentiate the different textures of igneous
rocks.
4. Compare and contrast the
formation of the different types
of igneous rocks.
Competency
6. One of the three major categories
of rocks.
The word igneous is derived from
the Latin word “IGNIS or IGNUS”
which means fire.
Igneous rocks are formed through
the process of solidification and
crystallization of molten rocks.
IGNEOUS ROCKS
7. What are the two (2)
types of Igneous Rocks
base on how they are
formed?
9. INTRUSIVE VS EXTRUSIVE
POINT OF COMPARISON INTRUSIVE ROCKS EXTRUSIVE ROCKS
OTHER TERM PLUTONIC ROCKS VOLCANIC ROCKS
LOCATION BENEATH THE EARTH SURFACE OF THE EARTH
PROCESS OF FORMATION PLUTONIC VOLCANIC
ORIGIN MAGMA LAVA
COLOR USUALLY DARK USUALLY LIGHT COLORED
DENSITY USUALLY DENSE USUALLY LIGHT DENSITY
COMPOSITION MAFIC FELSIC
RATE OF COOLING COOLS SLOWLY COOLS QUICKLY
SIZE OF GRAINS COARSE GRAIN FINE GRAIN
CRYSTALS LARGE CRYSTALS SMALL CRYSTALS
10. What are the two (2)
types of Igneous Rocks
base on composition?
11. 1. MAFIC IGNEOUS ROCKS
2. FELSIC IGNEOUS ROCKS
3. INTERMEDIATE IGNEOUS ROCKS
4. ULTRAMAFIC IGNEOUS ROCKS
BASE ON COMPOSITION:
12. ULTRAMAFIC MAFIC INTERMEDIATE FELSIC
VERY LOW SILICA
CONTENT(1-45%)
LOW SILICA
CONTENT(45-52%)
HIGH SILICA
CONTENT(53-65%)
VERY HIGH SILICA
CONTENT(65-100%)
VERY LOW
VISCOCITY
MAGMA
LOW VISCOSITY
MAGMA
INTERMEDIATE
VISCOSITY
MAGMA
HIGH VISCOSITY
MAGMA
COLOR BLACK TO
OLIVE GREEN
BLACK COLOR GRAY COLOR LIGHT COLOR
VERY HIGH
DENSITY
HIGH DENSITY INTERMEDIATE
DENSITY
VERY LOW DENSITY
PYROXENE,
OLIVINE
MAGNESIUM,
IRON
QUARTZ,
FELDSPAR
FELDSPAR, IRON
PERIODOTITE,
DUNITE
GABBRO, BASALT DIORITE,
ANDESITE
GRANITE, RYOLITE
13. What are the types of Igneous
Rocks based on texture?
