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pyrochlore

[pahy-ruh-klawr, -klohr]
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noun
  1. a mineral, chiefly composed of niobates of the cerium metals, occurring in syenites in the form of brown crystals.
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Origin of pyrochlore

From the German word Pyrochlor, dating back to 1820–30. See pyro-, chlor-1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018