Term used to describe silica-rich volcanic rock or magma. <ref>[http://vulcan.wr.usgs.gov/Glossary/volcano_terminology.html Glossary of Volcano and Related Terminology (Miller, 1989)]</ref>
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Term used to describe [[silica]]-rich [[volcano|volcanic]] [[rock]] or [[magma]]. <ref>[http://vulcan.wr.usgs.gov/Glossary/volcano_terminology.html Glossary of Volcano and Related Terminology (Miller, 1989)]</ref>