noun Petrology.
schist colored green by an abundance of chlorite, epidote, or actinolite.
Compare greenstone.

green + schist Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
greenschist   (grēn'shĭst')  Pronunciation Key 
A green, schistose metamorphic rock that gets its color from the presence of chlorite, epidote, or actinolite. Greenschist forms under conditions of low temperature and low pressure.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The greenschist is fine grained, dark greenish gray, and has good planar foliation.
These rocks are metamorphosed to upper greenschist facies.
The rocks have been metamorphosed to the zeolite and greenschist facies of regional metamorphism.
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