gadolinite

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Related to ytterbite: euxenite, gadolinite, xenotime

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.