Rhyolite

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Notion

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Science and technology

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What Wikipedia says

Rhyolite ( RY-ə-lyte) 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.

Excerpt from the Wikipedia article “Rhyolite”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Christian b219, CC BY-SA 3.0, via Wikimedia Commons.