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polycrase
释义
polycrase
polycrase
[
′päl·i‚krās
]
(mineralogy)
(Y,Ca,Ce,U,Th)(Ti,Cb,Ta)
2
O
6
Black mineral composed of titanate, columbate, and tantalate of yttrium-group metals; it is isomorphous with euxenite and occurs in granite pegmatites.
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更新时间:2026/9/7 13:17:32