Andesite

Properties
Rock group Igneous
Classification Extrusive/volcanic
Composition Intermediate
Texture Aphanitic
Porphyritic
Intrusive counterpart Diorite
Common minerals Plagioclase feldspar
Pyroxene
Hornblende

Andesite in Hand Sample

Campus andesite from El Paso, TX

Porphyritic andesite

Porphyritic andesite from the summit of Mt. Kilimanjaro

Porphyritic andesite from the Crazy Mountains, MT

Beartooth andesite

Andesite in Thin Section

Thin Section GigaPans

Porphyritic andesite, plane polars

Porphyritic andesite, crossed polars