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pegmatite

[ peg-muh-tahyt ]
/ ˈpɛg məˌtaɪt /
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noun Petrology.

a coarsely crystalline granite or other high-silica rock occurring in veins or dikes.

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Origin of pegmatite

1825–35; <Greek pēgmat- (stem of pêgma) anything fastened together, a bond (compare pēgnýein to stick) + -ite1

OTHER WORDS FROM pegmatite

peg·ma·tit·ic [peg-muh-tit-ik], /ˌpɛg məˈtɪt ɪk/, adjective

Words nearby pegmatite

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use pegmatite in a sentence

British Dictionary definitions for pegmatite

pegmatite
/ (ˈpɛɡməˌtaɪt) /

noun

any of a class of exceptionally coarse-grained intrusive igneous rocks consisting chiefly of quartz and feldspar: often occurring as dykes among igneous rocks of finer grain

Derived forms of pegmatite

pegmatitic (ˌpɛɡməˈtɪtɪk), adjective

Word Origin for pegmatite

C19: from Greek pegma something joined together
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for pegmatite

pegmatite
[ pĕgmə-tīt′ ]

Any of various coarse-grained igneous rocks that often occur as wide veins cutting across other types of rock. Pegmatites form from water-rich magmas or lavas that cool slowly, allowing the crystals to grow to large sizes. Although pegmatites can be compositionally similar to a number of rocks, they most often have the composition of granite.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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