gadolinite
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gadolinite
[′gad·əl·ə‚nīt] (mineralogy)
Be2FeY2Si2O10 A black, greenish-black, or brown rare-earth mineral; hardness is 6.5-7 on Mohs scale, and specific gravity is 4-4.5.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.