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Mineral: Sturmanite: Ca6(Fe+++,Al,Mn++)2(SO4)2[B(OH)4](OH)12ยท25(H2O)
Comments: Sharply terminated dark yellowish crystal of sturmanite with a few lesser crystals attached to one side.
Location: N'Chwaning mine, Kalahari Manganese Field, Northern Cape Province, South Africa.
Scale: 17 x 10 x 16 mm.
Copyright: © Dan Weinrich
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