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katoptrite

A monoclinic mineral, (Mn, Mg)13(Al, Fe)4Sb2Si2O28; in jet-black crystals in limestone at Nordmark and Laangban, Sweden.

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Kūrėjas

  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 points
  • 100% positive feedback
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