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todorokite

A monoclinic mineral, (Na,Ca)0.5(Mn,Mg)6O12.4H2O ; forms black spongy banded and reniform aggregates composed of minute lathlike crystals; in Hokkaido, Japan.

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Penulis

  • ed.young
  • (Milwaukee, United States)

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