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fersmite

An orthorhombic mineral, (Ca,Ce,Na)(Nb,Ta,Ti)2(O,OH,F)6; weakly radioactive; in syenites, may be associated with pyrochlore, alkali hornblende, apatite, sphene, magnetite, zircon, xenotime, or allanite; also in some marbles with columbite and monazite.

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  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 分数
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