Changes

An igneous rock with very large (usually > one inch), well-formed crystals. A granitic pegmatite has the mineralogy of a granite and abnormally large grains, whereas a gabbroic pegmatite has the mineralogy of a gabbro and very large grains. An intrusive igneous rock. (Plank and Schenck, 1998) <ref>[http://vulcan.wr.usgs.gov/Glossary/volcano_terminology.html Glossary of Volcano and Related Terminology]</ref>

A '''pegmatite''' is an [[igneous]] rock with very large (usually greater than one inch), well-formed [[crystal]]s. A granitic pegmatite has the [[mineralogy]] of a [[granite]] and abnormally large grains, whereas a gabbroic pegmatite has the mineralogy of a [[gabbro]] and very large grains. A pegmatite can also be an intrusive igneous rock. <ref>Plank and Schenck, 1998: [http://vulcan.wr.usgs.gov/Glossary/volcano_terminology.html Glossary of Volcano and Related Terminology]</ref>

==References==

==References==