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Rhyolite

A rock classification type
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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.


Unique IdentifiersHide

Mindat ID:
48451
Long-form identifier:
mindat:1:1:48451:8
GUID
(UUID V4):
64ee06e1-ac1d-4004-a205-6a15cfbe7199

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 > Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Silica > QuartzSiO2

Pronunciation of RhyoliteHide

Pronunciation:
PlayRecorded byCountry
Jolyon RalphUnited Kingdom

Age distributionHide

Recorded ages:
Neoproterozoic to Quaternary : 771 ± 2 Ma to 0.5 ± 0.15 Ma - based on 11 recorded ages.

Synonyms of RhyoliteHide

Other Language Names for RhyoliteHide

Irish Gaelic:Rialít

Varieties of RhyoliteHide

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

Not to be confused with the mineral nevadaite.

Common AssociatesHide

Associated Minerals Based on Photo Data:
54 photos of Rhyolite associated with QuartzSiO2
33 photos of Rhyolite associated with TopazAl2(SiO4)(F,OH)2
30 photos of Rhyolite associated with HematiteFe2O3
25 photos of Rhyolite associated with SanidineK(AlSi3O8)
22 photos of Rhyolite associated with Red BerylBe3Al2Si6O18
19 photos of Rhyolite associated with Bixbyite-(Mn)Mn3+2O3
14 photos of Rhyolite associated with PhlogopiteKMg3(AlSi3O10)(OH)2
13 photos of Rhyolite associated with TridymiteSiO2
13 photos of Rhyolite associated with Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
12 photos of Rhyolite associated with OpalSiO2 · nH2O

Internet Links for RhyoliteHide

References for RhyoliteHide

Reference List:
 
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