greenstone

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green·stone

 (grēn′stōn′)
n.
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.

greenstone

(ˈɡriːnˌstəʊn)
n
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

green•stone

(ˈgrinˌstoʊn)

n.
any of various altered basaltic rocks having a dark green color.
[1765–75]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.