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Rhyolite

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Name:
The term was coined in 1860 by Baron von Richthofen (grandfather of the World War I aviator). Etymol: Greek rhyo-, from rhyax, stream of lava.
Rhyolite, with felsic minerals comprising >20% quartz and alkali feldspar/plagioclase 40-90%.

A group of extrusive igneous rocks, typically porphyritic and commonly exhibiting flow texture, with phenocrysts of quartz and alkali feldspar in a glassy to cryptocrystalline groundmass; also, any rock in that group; the extrusive equivalent of granite. Rhyolite grades into rhyodacite with decreasing alkali feldspar content and into trachyte with a decrease in quartz.




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Classification of RhyoliteHide

Rhyolite appears in field 3 in the QAPF diagram.

Rhyolite is found in field 'R' in the TAS diagram [glossary item missing].

Sub-divisions of RhyoliteHide

Mineralogy of RhyoliteHide

Essential minerals - these are minerals that are required within the classification of this rock:
Feldspar > Alkali FeldsparFeldspar Group minerals rich in Potassium or Sodium.
Feldspar > PlagioclaseA petrological term for Albite-Anorthite Series.
Silica > QuartzSiO2

Synonyms of RhyoliteHide

Other Language Names for RhyoliteHide

Internet Links for RhyoliteHide

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