ground mass

groundmass

[ground-mas]
noun
the crystalline, granular, or glassy base or matrix of a porphyritic or other igneous rock, in which the more prominent crystals are embedded.

Origin:
1875–80; ground1 + mass

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To ground mass
Collins
World English Dictionary
groundmass (ˈɡraʊndˌmæs)
 
n
the matrix of igneous rocks, such as porphyry, in which larger crystals (phenocrysts) are embedded

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
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature