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[green-shist] /ˈgrinˌʃɪst/
noun, Petrology
schist colored green by an abundance of chlorite, epidote, or actinolite.
Compare greenstone.
Origin of greenschist Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for greenschist
  • 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.
greenschist in Science
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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