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Definition of: pegmatite

(pegmə·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 (-titik) adjective

Phrases starting with the letter: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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