Rhyolite is the most silica-rich of the volcanic rocks, generally glassy or fine-grained in texture but sometimes porphyritic, with larger phenocrysts set in a fine-grained groundmass. It is the extrusive equivalent of granite, formed from silica-rich magma extruded from a volcanic vent and cooled quickly at the surface. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/
Facts
Formation ClassIgneous, extrusive (the extrusive equivalent of granite, formed from silica-rich magma cooling quickly at the surface) 1 Classification
Classification UseIndustrial and Abrasive 2 Wikipedia 'Rhyolite' states this use (or use-bearing statement); earth5 pass. Rhyolite
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Associated With
Compositional series: dacite sits between andesite and rhyolite in silica content.
Source Dacite (Wikipedia)
Sanidine and plagioclase are both feldspar-group minerals; feldspar is a principal mineral of rhyolite.
Source Rhyolite (Wikipedia)
Extrusive equivalent of intrusive granite.
Source Rhyolite (Wikipedia)
Source Lava dome (Wikipedia)
Quartz named directly as a predominant mineral of rhyolite.
Source Rhyolite (Wikipedia)
Caused By
Source Rhyolite (Wikipedia)
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Sources
1. Rhyolite (Wikipedia)
Wikimedia FoundationLead section
It is the extrusive equivalent of granite.
Lead section
Rhyolite ( RY-ə-lyte) is the most silica-rich of volcanic rocks. It is generally glassy or fine-grained (aphanitic) in texture, but may be porphyritic, containing larger mineral crystals (phenocrysts) in an otherwise fine-grained groundmass.
Associated With: Feldspar, Mineralogy section
The mineral assemblage is predominantly quartz, sanidine, and plagioclase.
Associated With: Quartz, Mineralogy section
The mineral assemblage is predominantly quartz, sanidine, and plagioclase.
Caused By: Volcanism, Lead paragraph
Rhyolite ( RY-ə-lyte) is the most silica-rich of volcanic rocks
View the Source 2. Wikidata: Rhyolite
Wikidata Q190727
3. Geology.com: Rhyolite
Geology.comArticle text, colour-categoryQuote, Article text, colour-category
Rhyolite is an extrusive igneous rock with a very high silica content. It is usually pink or gray in color with grains so small that they are difficult to observe without a hand lens.
Dacite (Wikipedia)
Wikimedia FoundationAssociated With: Dacite, Lead sectionQuote, Associated With: Dacite, Lead section
intermediate in composition between andesite and rhyolite.
Lava dome (Wikipedia)
Associated With: Lava Dome, Lead sectionQuote, Associated With: Lava Dome, Lead section
Since viscous basaltic and andesitic domes weather fast and easily break apart by further input of fluid lava, most of the preserved domes have high silica content and consist of rhyolite or dacite.
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