pegmatites

pegmatite

[peg-muh-tahyt]
noun Petrology.
a coarsely crystalline granite or other high-silica rock occurring in veins or dikes.

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

pegmatitic [peg-muh-tit-ik] , adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To pegmatites
Collins
World English Dictionary
pegmatite (ˈpɛɡməˌtaɪt)
 
n
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]
 
pegmatitic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
American Heritage
Science Dictionary
pegmatite   (pěg'mə-tīt')  Pronunciation Key 
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 © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
Related Words
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature