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Andesite () is a volcanic rock of intermediate composition. In a general sense, it is the intermediate type between silica-poor basalt and silica-rich rhyolite. It is fine-grained (aphanitic) to porphyritic in texture, and is composed predominantly of sodium-rich plagioclase plus pyroxene or hornblende.

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Andesite is a volcanic rock that falls between basalt and rhyolite in terms of silica content, making it an intermediate type of igneous rock. It is composed mainly of sodium-rich plagioclase minerals along with pyroxene or hornblende, and has a fine-grained texture that may include some larger crystals visible to the naked eye.

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Key facts

Rock.name: Andesite
Rock.type: Igneous
Rock.image: Amygdaloidal andesite.jpg
Rock.caption: A sample of andesite (dark groundmass) with amygdaloidal vesicles filled with zeolite. Diameter of view is 8 cm.
Rock.composition: Intermediate: plagioclase (often andesine) and pyroxene or hornblende
Rock.composition_secondary: Magnetites, biotite, sphene, and quartz

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Wikidata facts

Subclass of: volcanic rock
Image: Amygdaloidal andesite.jpg

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described by source: Encyclopædia Britannica 11th edition
Commons category: Andesite
exact match: purl.obolibrary.org/obo/ENVO_01000441

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