Difference between revisions of "Pumice"
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| − | + | '''Pumice''' is a light-colored, frothy volcanic rock, usually of [[dacite]] or [[rhyolite]] composition, formed by the expansion of gas in erupting [[lava]]. Commonly perceived as lumps or fragments of pea size and larger but can also occur abundantly as ash-size particles.<ref name="vulcan">[http://vulcan.wr.usgs.gov/Glossary/volcano_terminology.html Glossary of Volcano and Related Terminology (Foxworthy and Hill, 1982)]</ref> | |
| − | Because of its numerous gas pockets, pumice commonly floats on water. <ref | + | Because of its numerous gas pockets, pumice commonly floats on water. <ref name="vulcan" /> |
Pumice stones are used domestically as a mild abrasive to remove hard skin. | Pumice stones are used domestically as a mild abrasive to remove hard skin. | ||
Revision as of 02:53, September 1, 2008
Pumice is a light-colored, frothy volcanic rock, usually of dacite or rhyolite composition, formed by the expansion of gas in erupting lava. Commonly perceived as lumps or fragments of pea size and larger but can also occur abundantly as ash-size particles.[1]
Because of its numerous gas pockets, pumice commonly floats on water. [1]
Pumice stones are used domestically as a mild abrasive to remove hard skin.