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. (Foxworthy and Hill, 1982)  
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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>
*'''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. (USGS/VHP) <ref>[http://vulcan.wr.usgs.gov/Glossary/volcano_terminology.html Glossary of Volcano and Related Terminology]</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 23:53, 9 July 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]

References

  1. Glossary of Volcano and Related Terminology (Foxworthy and Hill, 1982)
  2. Glossary of Volcano and Related Terminology (USGS/VHP)