About rhyolite

Rhyolite is the most silica-rich of volcanic rocks. It is generally glassy or fine-grained (aphanitic) in texture, but may be porphyritic, containing larger mineral crystals (phenocrysts) in an otherwise fine-grained groundmass. The mineral assemblage is predominantly quartz, sanidine, and plagioclase. It is the extrusive equivalent of granite.

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Facts from Wikidata (CC0). Image by Christian b219 via Wikimedia Commons (CC BY-SA 3.0).

rhyolite

igneous, volcanic rock, of felsic (silica-rich) composition

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Facts from Wikidata (CC0). Image by Christian b219 via Wikimedia Commons (CC BY-SA 3.0).

Not who you're looking for? Others named rhyolite: ghost town in Nye County, Nevada

rhyolite across IJR

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