Andesite

Andesite

Texture: Aphanitic (Fine-grained)

Orgin: Extrusive/Volcanic

Chemical Composition: Intermediate

Color: Medium Gray

Mineral Composition: Sodium-Calcium Plagioclase, Hornblende, Biotite

Tectonic Environment: Convergent Boundary - Both Island Arc-type and Andean-type subduction zones





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All images used on this page are from Dr. Harper's Igneous Rocks Page