Pegmatite

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A pegmatite is an igneous rock with very large (usually greater than 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. A pegmatite can also be an intrusive igneous rock. [1]

References

  1. Plank and Schenck, 1998: Glossary of Volcano and Related Terminology
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