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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

QAPF_V_3.png

Rhyolite appears in field 3 in the QAPF diagram.

TAS_R.png

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 FeldsparA subgroup of the Feldspar Group, poor in calcium, and mostly rich in potassium.
Feldspar > PlagioclaseA petrological term for Albite-Anorthite Series.
Silica > QuartzSiO2

Pronounciation of RhyoliteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Age distributionHide

Recorded ages:
Neoproterozoic to Quaternary : 771 ± 2 Ma to 0.5 ± 0.15 Ma - based on 9 recorded ages.

Synonyms of RhyoliteHide

Varieties of RhyoliteHide

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

Internet Links for RhyoliteHide

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https://www.mindat.org/min-48451.html
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