Igneous Rocks
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12 Terms
Granite
Felsic
Texture: Phaneritic (coarse grain)
Mineral 1: Quartz
Mineral 2: Orthoclase feldspar
Rhyolite
Felsic
Texture: Aphanitic (fine grains)
Mineral 1: Quartz
Mineral 2: Orthoclase feldspar
Obsidian
Felsic/intermediate/mafic
Texture: Glassy
All minerals
Pumice
Felsic/intermediate/mafic
Texture: Foamy/vesicular
All minerals
Tuff
Felsic
Texture: Pyroclastic (fragmental)
Mineral 1: Quartz
Mineral 2: Orthoclase feldspar
Diorite
Intermediate
Texture: Phaneritic
Mineral 1: Hornblende
Mineral 2: Plagioclase feldspar
Andesite
Intermediate
Texture: Aphanitic
Mineral 1: Hornblende
Mineral 2: Plagioclase feldspar
Andesite Porphry
Intermediate
Texture: Phoephyritic (2 grain sizes)
Mineral 1: Hornblende
Mineral 2: Plagioclase feldspar
Gabbro
Mafic
Texture: Phaneritic
Mineral 1: Augite
Mineral 2: Plagioclase feldspar
Basalt
Mafic
Texture: Aphanitic
Mineral 1: Augite
Mineral 2: Plagioclase feldspar
Granite pegmatite
Mineral 1: Quartz
Mineral 2: Plagioclase feldspar
Scoria
Mineral 1: olivine/augite
Mineral 2: plagioclase feldspar
Note 
Flashcards (20)