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greenstone

[green-stohn] /ˈgrinˌstoʊn/
noun
1.
any of various altered basaltic rocks having a dark-green color caused by the presence of chlorite, epidote, etc.
Origin
1765-1775
1765-75; green + stone
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for green stone

greenstone

/ˈɡriːnˌstəʊn/
noun
1.
any basic igneous rock that is dark green because of the presence of chlorite, actinolite, or epidote
2.
a variety of jade used in New Zealand for ornaments and tools
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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green stone in Science
greenstone
  (grēn'stōn')   
Any of various green metamorphic rocks formed from igneous rocks that have a relatively low silica content and owe their color to the presence of a green mineral such as chlorite, hornblende, or epidote.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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