Igneous Rocks

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