fergusonite

fergusonite

[fur-guh-suh-nahyt]
noun
a rare-earth mineral, yttrium columbate and tantalate, found in pegmatites.

Origin:
1820–30; named after R. Ferguson, 19th-century Scottish physician; see -ite1

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WordNet
fergusonite

noun
a dark mineral consisting of oxides of yttrium and erbium and tantalum and other minerals 
WordNet® 3.0, © 2006 by Princeton University.
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