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berthierine

A monoclinic mineral, (Fe2+,Fe3+,Mg)2-2D3(Si,Al)2O5(OH)4of the kaolinite-serpentine group; dark steel-gray; in low-temperature vein deposits.

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Looja

  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 points
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