Difference between revisions of "Rhyolite"
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(New page: *Volcanic rock (or lava) that characteristically is light in color, contains 69 percent silica or more, and is rich in potassium and sodium. (Foxworthy and Hill, 1982) *'''Rhyolite''' is ...) |
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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]]. <ref>[http://vulcan.wr.usgs.gov/Glossary/volcano_terminology.html Glossary of Volcano and Related Terminology (Foxworthy and Hill, 1982) ]</ref> | |
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| + | '''Rhyolite''' is a light-colored rock with [[silica]] (SiO2) content greater than about 68 weight percent. [[Sodium]] and [[potassium]] [[oxides]] both can reach about 5 weight percent. Common mineral types include [[quartz]], [[feldspar]] and [[biotite]] and are often found in a glassy [[matrix]]. Rhyolite is erupted at temperatures of 700 to 850° C. <ref>[http://vulcan.wr.usgs.gov/Glossary/volcano_terminology.html Glossary of Volcano and Related Terminology (USGS/VHP)]</ref> | ||
==References== | ==References== | ||
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Revision as of 05:53, July 10, 2007
Volcanic rock (or lava) that characteristically is light in color, contains 69 percent silica or more, and is rich in potassium and sodium. [1]
Rhyolite is a light-colored rock with silica (SiO2) content greater than about 68 weight percent. Sodium and potassium oxides both can reach about 5 weight percent. Common mineral types include quartz, feldspar and biotite and are often found in a glassy matrix. Rhyolite is erupted at temperatures of 700 to 850° C. [2]
