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