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Rhyolite

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About RhyoliteHide

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.




Classification of RhyoliteHide

Rhyolite appears in field 3 in the QAPF diagram.

Rhyolite is found in field 'R' in the TAS diagram.

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

Pronounciation of RhyoliteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Synonyms of RhyoliteHide

Varieties of RhyoliteHide

NevaditeA highly porphyritic variety of rhyolite, rich in quartz phenocrysts.

Not to be confused with the mineral nevadaite.

Internet Links for RhyoliteHide

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