noun Petrography.
a metamorphic rock composed mainly of amphibole and plagioclase.

1825–35; amphibole + -ite1

amphibolitic [am-fib-uh-lit-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
amphibolite (æmˈfɪbəˌlaɪt)
a metamorphic rock consisting mainly of amphibole and plagioclase

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
amphibolite   (ām-fĭb'ə-līt')  Pronunciation Key 
A metamorphic rock composed chiefly of amphibole and plagioclase and having little or no quartz.
The American Heritage® Science Dictionary
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