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IGNEOUS ROCK
TEXTURE
C
Coarsed
Ex: granite
Fine
Ex: rhyolite
IGNEOUS ROCKS
TEXTURE
C
GLASSY
EX: OBSIDIAN
PUMICE
PORPHYRITIC
EX: ANDESITE
This is an extrusive porphyritic rock, as
the pink (and black) phenocrysts are
clearly visible, in contrast the grey
groundmass with its microscopic crystals.
IGNEOUS ROCK
COMPOSITION
GRANITIC
EX: GRANITE
BASALTIC
EX: BASALT.
SEDIMENTARY ROCK
BASED ON HOW THEY ARE FORMED
CLASTIC
EX: SANDSTONE
CHEMICAL &
BIOCHEMICAL
EX:LIMESTONES
HOW METAMORPHIC ROCKS ARE FORMED?
CONTACT METAMORPHISM
EX: MARBLE
REGIONAL METAMORPHISM
DURING MOUNTAIN
BUILDING
AGENTS OF METAMORPHISM
HEAT
-drives chemical PRESSURE
HYDROTHERMAL
SOLUTIONS
reaction causing
minerals to
-causes spaces
recrystallize
between minerals to -promote
close
-comes from
recrystallization
magma &
change in
temperature
with depth
-increases with
depth
-applied in all
CLASSIFICATION OF METAMORPHIC ROCKS
NONFOLIATED
FOLIATED
EX: MARBLE
EX: GNEISS (NICE)