Flashcards
Geology Common Igneous Rocks
Cards in this deck (7)
- 1—Andesite:
Aphanitic to porphrytic texture, extrusive
Rich in plagioclase feldspar and may contain biotite, pyroxene or amphibole
Usually does not contain quartz or olivine - 2—Basalt:
Fine-grained, composed mainly of plagioclase and pyroxene
Extrusive
Most areas within basin underlain by basalt
Abundant rock on moon
- 3—Dacite:
Often porphrytic
Quartz and plagioclase
Fine-grained equivalent of granodiorite
Can also have some biotite, hornblende
- 4—Diorite:
Intermediate between granite and basalt
Plagioclase, hornblende and biotite
Very little quartz
- 5—Gabbro:
Mainly plagioclase and augite
Some olivine might be present
Very little quartz
- 6—Obsidian:
extrusive
mineraloid
volcanic glass, conchoidal
- 7—Dolerite:
Mafic, holocrystalline
Plagioclase and pyroxene
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- Science Flashcards on Geology Common Igneous Rocks, created by Cate Ward on 10/09/2019.
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- Cate Ward
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