polycrase


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polycrase

[′päl·i‚krās]
(mineralogy)
(Y,Ca,Ce,U,Th)(Ti,Cb,Ta)2O6 Black mineral composed of titanate, columbate, and tantalate of yttrium-group metals; it is isomorphous with euxenite and occurs in granite pegmatites.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.