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eclogite

[ek-luh-jahyt] /ˈɛk ləˌdʒaɪt/
noun
1.
a rock consisting of a granular aggregate of green pyroxene and red garnet, often containing kyanite, silvery mica, quartz, and pyrite.
Origin
1815-1825
1815-25; < Greek eklog() selection (see eclogue) + -ite1
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for eclogite

eclogite

/ˈɛkləˌdʒaɪt/
noun
1.
a rare coarse-grained basic rock consisting principally of garnet and pyroxene. Quartz, feldspar, etc, may also be present. It is thought to originate by metamorphism or igneous crystallization at extremely high pressure
Word Origin
C19: from Greek eklogē a selection
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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eclogite in Science
eclogite
  (ěk'lə-jīt')   
A greenish, coarse-grained metamorphic rock consisting of pyroxene, quartz, and feldspar with large red garnet inclusions. Eclogites form under conditions of high pressure and moderate to high temperatures.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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