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Igneous Rock Review

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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Igneous Rock Review

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  1. Igneous Rock Review

  2. Granite – Igneous -phaneritic -felsic (low contain of heavy and dark minerals)

  3. Diorite – Igneous -phaneritic -andesitic -medium amount of heavy and dark minerals

  4. Gabbro -phaneritic -mafic appearnace…..high content of dark and heavy minerals

  5. Rhyolite -Aphanitic -fined grained crystals -felsic

  6. Andesite -aphanitic -fine grain size -andesitic in color

  7. Basalt -aphanitic -mafic (high content of iron/magnesium/heavy minerals -found @ the bottom of the ocean

  8. Pumice -vesicular (holy rock) -high content of light colored silicates -will float in water

  9. Scoria -vesicular (holy rock) -mafic (high content of iron/magnesium/ heavier minerals -will not float in water

  10. Obsidian -glass or extremely aphanitic -called “volcanic glass”

  11. Porphyritic Granite -aphanitic and phaneritic -2 cooling rates

  12. Pegmatite Granite -extremely large crystals (super slow cooling rate)

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