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Ettringite, Sturmanite


Ettringite : Ca6Al2[(OH)4|SO4]3 · 26H2O, Sturmanite : Ca6(Fe3+,Al,Mn3+)2[(OH)12|B(OH)4|(SO4)2] · 25H2O

Photo Copyright © 2997 Michael C. Roarke  - This image is copyrighted. Unauthorized reproduction prohibited.
Locality: N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa
35 x 25 mm. Ettringite, sturmanite crystals. RFC M1648.

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