홈 > Term: polycrase
polycrase
An orthorhombic mineral, (Y,Ca,Ce,U,Th)(Ti,Nb,Ta)2O6; black; in granite pegmatites. Formerly spelled polykras.
- 품사: noun
- 분야/도메인: 광업
- 카테고리: 일반 광산; Mineral mining
- Government Agency: USBM
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- ed.young
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