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Sturmanite, Ca6(Fe+++,Al,Mn++)2(SO4)2[B(OH)4](OH)12•25(H2O), N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese field, Northern Cape Province, South Africa. 2.1 x 2.1 x 1.6 cm. Three, stacked, pagoda-like, hexagonal, honey-brown crystals. Copyright © Rob Lavinsky & irocks.com

Sturmanite, Ca6(Fe+++,Al,Mn++)2(SO4)2[B(OH)4](OH)12•25(H2O), N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese field, Northern Cape Province, South Africa. 3.1 x 2.8 x 2.1 cm. Transparent (!), gemmy , sharply formed sturmanite xls to 1.3 cm in size. Copyright: © Rob Lavinsky

Sturmanite, Ca6(Fe+++,Al,Mn++)2(SO4)2[B(OH)4](OH)12•25(H2O), N'Chwaning, Kalahari Manganese Field, Northern Cape province, South Africa. Size 82x55x34 mm. Copyright: Watzl Minerals

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, Northern Cape Province, South Africa. Fov 2 mm. Photo © Pierre Rondelez

Sturmanite, Ca6(Fe+++,Al,Mn++)2(SO4)2[B(OH)4](OH)12•25(H2O), Wessels Mine, Hotazel​​, Kalahari Manganese Fields, Northern Cape Province, South Africa. Orange red, transparent, hexagonal, discoidal crystals. Collection: Lithothek Munich Micromounter. Copyright : Klaus - Dieter Bausch

Sturmanite, Ca6(Fe+++,Al,Mn++)2(SO4)2[B(OH)4](OH)12•25(H2O) , N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese field, Northern Cape Province, South Africa. Copyright © Mike and Diana Hopkins

Thaumasite, Ca3Si(CO3)(SO4)(OH)6•12(H2O), Caspar Quarry, Ettringer Bellerberg, Ettringen, Eifel, Germany. Fov 3 mm. Copyright: Stephan Wolfsried

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

Charlesite. Ca6 (Al,Si) 2(SO4) 2 B(OH) 4 (OH,O) 12. 26H 2 O. N'Chwaning, Kalahari Manganfeld, Northern Cape province, South Africa. Group of prismatic yellow crystals of charlesite up to 2.7 mm. Copyright Enrico Bonacina. Collection: Domenico Preite

Jouravskite, Ca3Mn++++(SO4,CO3)2(OH)6•12(H2O) , N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese field, Northern Cape Province, South Africa. 2.5 x 1.8 x 1.4 cm. A glowing yellow "gem" of intergrown microcrystals showing intense color saturation and an unusually high luster for the species. Copyright © Rob Lavinsky & irocks.com