a mineral, tantalite and niobate of yttrium and various elements, as iron, and cerium, occurring in the form of brown-black crystals.

1800–10; yttro- (combining form of yttrium) + tantalite Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Produced a few hundred kilograms of yttrotantalite and gadolinite.
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