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Sturmanite, Ca6(Fe+++,Al,Mn++)2(SO4)2[B(OH)4](OH)12•25(H2O), N'Chwaning III Mine, Kalahari Manganese Fields, Kuruman, Northern Cape, South Africa

Sturmanite, Ca6(Fe+++,Al,Mn++)2(SO4)2[B(OH)4](OH)12•25(H2O), N'Chwaning III Mine, N'Chwaning Mines, Kuruman, Kalahari manganese Field, South Africa

Ettringite - N'chwaning Mine, Kuruman, South Africa Size: 3.3 cm

Sturmanite. N'Chwaning III Mine, N'Chwaning Mines, Kuruman, Kalahari manganese field, Northern Cape Province, South Africa FOV=2 mm Photo © Pierre Rondelez

Guanacoite, El Guanaco Mine, Taltal, Chile. Fov 2 mm. Photo Christian Rewitzer

Sturmanite, Ca6(Fe+++,Al,Mn++)2(SO4)2[B(OH)4](OH)12•25(H2O) , N'Chwaning Mine, Kalahari Mn Field, Northern Cape province, South Africa

Calcite on Améthyst from Brazil(pièce de musée)

Despujolsite from N'Chwaning III Mine, Kalahari, South Africa #mineral

Tourmaline "Rubelite" from Pederneira, Brazil (specimen: Fine Mineral International, photography: James Elliott)

Iridescent Botryoidal Brucite ~ N'Chwaning II Mine, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa