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Peralkaline rhyolite

A rock subtype
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A rhyolite containing alkali pyroxenes or amphiboles, or with (Na2O+K2O)>Al2O3.


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Unique IdentifiersHide

Mindat ID:
48453
Long-form identifier:
mindat:1:1:48453:6

Classification of Peralkaline 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 Peralkaline rhyoliteHide

Mineralogy of Peralkaline 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.
Silica > QuartzSiO2
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Alkali pyroxeneA petrological name for the sodium-rich pyroxenes aegirine and aegirine-augite.
Amphibole(Na, K, ◻)(Ca,Na)2(Mg,Fe,Al)5((Si,Al)8O22)(OH,F,Cl,O)2
Feldspar > Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8

Pronunciation of Peralkaline rhyoliteHide

Pronunciation:
PlayRecorded byCountry
Jolyon RalphUnited Kingdom

Age distributionHide

Recorded ages:
Phanerozoic : 137.2 ± 0.8 Ma to 0.11 ± 0.10 Ma - based on 7 recorded ages.

Synonyms of Peralkaline rhyoliteHide

Internet Links for Peralkaline rhyoliteHide

References for Peralkaline rhyoliteHide

Reference List:
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