noun \ˈpeg-mə-ˌtīt\

Definition of PEGMATITE

:  a coarse variety of granite occurring in dikes or veins
peg·ma·tit·ic \ˌpeg-mə-ˈti-tik\ adjective


French, from Greek pēgmat-, pēgma something fastened together, from pēgnynai to fasten together — more at pact
First Known Use: circa 1828


noun    (Concise Encyclopedia)

Almost any wholly crystalline igneous rock that is at least in part very coarse-grained, the major constituents of which include minerals typically found in ordinary igneous rocks (such as granites) and in which extreme textural variations, especially in grain size, are characteristic. Usually found as irregular dikes, lenses, or veins, pegmatite deposits occur in all parts of the world and are the chief source of commercial feldspar, sheet mica, and beryllium, tantalum-niobium, and lithium minerals.


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