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Sturmanite - N'Chwaning I Mine, N'Chwaning Mines, Kuruman, Kalahari manganese field, Northern Cape Province, South Africa (#:MINS8036)

Cluster of hexagonal Sturmanite xls up to 1 cm wide.

Formula :
Ca6(Fe3+,Al,Mn2+)2[(OH)12/B(OH)4/(SO4)2] * 25 H2O
System: trigonal Hardness:2½ Rarity:very rare
Strunz id:VI/D.13-50 - SULFATES, CHROMATES, MOLYBDATES and TUNGSTATES
Name origin: Named in 1983 by Donald R. Peacor, Pete J. Dunn, and Marjorie Duggan in honor of Bozidar Darko Sturman [b. 1937], Slovenian-Canadian mineralogist and former Associate Curator of Mineralogy, Royal Ontario Museum, Toronto, Ontario, for his contributions to systematic mineralogy, in particular his studies of phosphate minerals from the Yukon and his refinement of methods used in optical mineralogy.

Specimen weight:10 gr.
Crystal size:Up to 10 mm
Overall size: 43mm x 30 mm x 20 mm

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Sturmanite - N'Chwaning I Mine, N'Chwaning Mines, Kuruman, Kalahari manganese field, Northern Cape Province, South Africa

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