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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>[http://vulcan.wr.usgs.gov/Glossary/volcano_terminology.html Glossary of Volcano and Related Terminology (Foxworthy and Hill, 1982)]</ref>  

'''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>[http://vulcan.wr.usgs.gov/Glossary/volcano_terminology.html Glossary of Volcano and Related Terminology]</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.