rhyolitoid (Q116452051)
is a volcanic rock made of quartz phenocrysts, sanidine, then plagioclase (albite and oligoclase) and a small amount of biotite, less often amphibole or pyroxene.
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description is a volcanic rock made of quartz phenocrysts, sanidine, then plagioclase (albite and oligoclase) and a small amount of biotite, less often amphibole or pyroxene.

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(P7348) 2196