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Related to greenstone: Greenstone belt
Any of various altered basic igneous rocks colored green by chlorite, hornblende, or epidote.
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.
1. (Geological Science) any basic igneous rock that is dark green because of the presence of chlorite, actinolite, or epidote
2. (Minerals) a variety of jade used in New Zealand for ornaments and tools
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
any of various altered basaltic rocks having a dark green color.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.