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A coarse-grained granite, sometimes rich in rare elements such as uranium, tungsten, and tantalum.
[Greek pēgma, pēgmat-, something fastened together (from pēgnunai, to fasten; see pag- in Indo-European roots) + -ite.]
peg′ma·tit′ic (-tĭt′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Geological Science) 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
[C19: from Greek pegma something joined together]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a coarsely crystalline granite or other high-silica rock occurring in veins or dikes.
[1825–35; < Greek pēgmat- (s. of pêgma) anything fastened together, a bond (compare pēgnýein to stick) + -ite1]
peg`ma•tit′ic (-ˈtɪt ɪk) adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
Any of various coarse-grained igneous rocks that often occur as wide veins cutting across other types of rock. Pegmatites form from magma or lava that is rich in water and cools slowly, allowing the crystals to grow to large sizes.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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|Noun||1.||pegmatite - a form of igneous rock consisting of extremely coarse granite resulting from the crystallization of magma rich in rare elements|
igneous rock - rock formed by the solidification of molten magma
samarskite - a complex black mineral occurring in pegmatites
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