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from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A brown or black tantalate of uranium, yttrium, and calcium.

from The Century Dictionary and Cyclopedia

  • n. A rare mineral found at Ytterby, Sweden, of a black or brown color. It is a tantalate of yttrium, uranium, and iron, with calcium.


yttro- +‎ tantalite (Wiktionary)


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