pyrochlore

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pyrochlore

[′pī·rə‚klȯr]
(mineralogy)
(Na,Ca)2(Nb,Ta)2O6(OH,F) Pale-yellow, reddish, brown, or black mineral, crystallizing in the isometric system, and occurring in pegmatites derived from alkalic igneous rocks. Also known as pyrrhite.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.