1) Aphanitic rock 2) Gemstone 3) Igneous rock 4) Very acid volcanic rock 5) Volcanic granite
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Volcanic rock (or lava) that characteristically is light in color, contains 69 percent silica or more, and is rich in potassium and sodium. It is fine grained, which although different in texture, has the same composition as granite
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http://jersey.uoregon.edu/~mstrick/geology/geo_glossary_page.html
• (n.) A quartzose trachyte, an igneous rock often showing a fluidal structure.
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http://thinkexist.com/dictionary/meaning/rhyolite/
(from the article `Death Valley`) ...sprang up from the late 19th to the early 20th century following gold, copper, and silver strikes in the area. Deserted when the mines were ...
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http://www.britannica.com/eb/a-z/r/44
extrusive igneous rock that is the volcanic equivalent of granite. Most rhyolites are porphyritic, indicating that crystallization began prior to ... [4 related articles]
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http://www.britannica.com/eb/a-z/r/44
Flow banding in rhyolite lava from Mono-Inyo Craters volcanic chain, California (black bands composed of obsidian). Credit: U.S. Geological Survey A light-colored rock with silica (SiO
2) content greater than about 68 weight percent. Sodium and potassium oxides both can re...
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http://www.daviddarling.info/encyclopedia/R/rhyolite.html
<geology> A quartzose trachyte, an igneous rock often showing a fluidal structure. ... Origin: Gr. To flow. ... (23 Aug 1998) ...
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Any of a group of felsic igneous rocks that are the extrusive equivalents of granite.
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http://www.encyclo.co.uk/local/22291
The fine-grained volcanic or extrusive rocks that are equivalent in composition to granite. Normally
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http://www.encyclo.co.uk/local/22392
Rhy'o·lite noun [ Greek
'rei^n to flow +
-lite .]
(Min.) A quartzose trachyte, an igneous rock often showing a fluidal structure. --
Rhy`o*lit'ic ,
adjective Found on
http://www.encyclo.co.uk/webster/R/78
A fine-grained volcanic rock composed of quartz, K-feldspar, and plagioclase. It is the extrusive equivalent of a granite.
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http://www.evcforum.net/WebPages/Glossary_Geology.html
rhyolite lava erupts at 700 to 850°C and contains a silica content of over 68 percent; it can also include the minerals quartz, feldspar, and biotite, which harden with a glasslike texture
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http://www.pbs.org/wgbh/nova/volcano/glossary.html
A fine grained extrusive igneous rock that is rich in quartz and potassium feldspar. Derived from felsic magma.
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http://www.physicalgeography.net/physgeoglos/r.html
Rhyolite is a fine grained extrusive igneous rock similar to granite. Rhyolite forms from particularly viscous molten lava and is grey, brown or reddish in colour, darkening with age. Rhyolite is essentially composed of feldspar, mica and quartz with numerous accessory minerals present.
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http://www.probertencyclopaedia.com/browse/HR.HTM
An igneous, volcanic (extrusive) rock, of felsic (silica-rich) composition, typically more than 69% silicon dioxide, SiO2. Rhyolite usually exhibits flow lines.
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http://www.scientificpsychic.com/etc/geology-glossary.html
Fine-grained extrusive igneous rock, commonly with phenocrysts of quartz and feldspar in a glassy groundmass.
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Highly felsic igneous volcanic rock, typically light in color; rough volcanic equivalent of granite.
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http://www.ucmp.berkeley.edu/glossary/gloss2geol.html
Highly felsic igneous volcanic rock, typically light in color; rough volcanic equivalent of granite.
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http://www.ucmp.berkeley.edu/glossary/glossary_2.html
the aphanitic equivalent of granite.
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https://www.encyclo.co.uk/local/20132
noun very acid volcanic rock
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https://www.encyclo.co.uk/local/20974
Igneous rock, the fine-grained volcanic (extrusive) equivalent of granite
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https://www.encyclo.co.uk/local/21221
A type of highly viscous magma with high silica content; it is found as pumice (in airfall deposits or ignimbrites), lava or obsidian. Rhyolite is also the name given to the volcanic rock formed from rhyolitic magma.
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https://www.encyclo.co.uk/local/21337
A fine-grained silica-rich igneous rock, the extrusive equivalent of granite.
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https://www.encyclo.co.uk/local/22327
A fine-grained, extrusive igneous rock, which has the same chemical composition as granite.
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https://www.encyclo.co.uk/local/22734
fine-grained, igneous rock formed from a very viscous type of lava produced by some volcanoes.
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https://www.geolsoc.org.uk/ks3/gsl/education/resources/rockcycle/page3451.h
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