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

Porphyritic andesite, plane polars
Porphyritic andesite in plane polarized light. Magnification: 40x Click here for crossed polars: Click here to explore this slide in plane polars: https://vi…

Porphyritic andesite, crossed polars
Porphyritic andesite in cross polarized light. Magnification: 40x Click here for plane polars: https://youtu.be/hO28wMy0wu0 Click here to explore this slide …