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epistolite

A triclinic mineral, Na2(Nb,Ti)2Si2O9.nH2O ; forms soft, pearly white rectangular plates in curved folia in the Julianehaab district of Greenland and the Lovozero alkali massif, Kola Peninsula, Russia.

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  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 分数
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