any of various altered basaltic rocks having a dark-green color caused by the presence of chlorite, epidote, etc.

1765–75; green + stone Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
greenstone (ˈɡriːnˌstəʊn)
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 10th Edition
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American Heritage
Science Dictionary
greenstone   (grēn'stōn')  Pronunciation Key 
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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Example sentences
It contains numerous intrusive bodies and volcanically- derived greenstone belts.
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