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Igneous Rock Review. Granite – Igneous - phaneritic -felsic (low contain of heavy and dark minerals). Diorite – Igneous - phaneritic -andesitic -medium amount of heavy and dark minerals. Gabbro - phaneritic -mafic appearnace …..high content of dark and heavy minerals.
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Granite – Igneous -phaneritic -felsic (low contain of heavy and dark minerals)
Diorite – Igneous -phaneritic -andesitic -medium amount of heavy and dark minerals
Gabbro -phaneritic -mafic appearnace…..high content of dark and heavy minerals
Rhyolite -Aphanitic -fined grained crystals -felsic
Andesite -aphanitic -fine grain size -andesitic in color
Basalt -aphanitic -mafic (high content of iron/magnesium/heavy minerals -found @ the bottom of the ocean
Pumice -vesicular (holy rock) -high content of light colored silicates -will float in water
Scoria -vesicular (holy rock) -mafic (high content of iron/magnesium/ heavier minerals -will not float in water
Obsidian -glass or extremely aphanitic -called “volcanic glass”
Porphyritic Granite -aphanitic and phaneritic -2 cooling rates
Pegmatite Granite -extremely large crystals (super slow cooling rate)