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Definition of: pegmatite
(peg′mə·tīt) noun
A very coarsegrained granitic rock composed chiefly of orthoclase, quartz, and mica (usually muscovite); graphic granite: often occurs in veins or dikes. [<Gk. pēgma, -atos a solid mass + -ITE1]
—peg′ma·tit′ic (-tit′ik) adjective
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