Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Sturmanite from
Black Rock Mine, Black Rock, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa


Locality type:Mine
Classification
Species:Sturmanite
Formula:Ca6Fe23+(SO4)2.5[B(OH)4](OH)12 · 25H2O
Comments:Although this locality is the type locality for the mineral, it is believed that the actual type locality is the Wessels mine due to an error in labeling the type specimen. No subsequent specimens containing sturmanite or other minerals on the type specimen have been found since, similar material from Wessels was found from 5 pockets in the years 1978-1982.
Confirmation
Validity:Unconfirmed/Questioned
Data
Mineral Data:Click here to view Sturmanite data
Locality Data:Click here to view Black Rock Mine, Black Rock, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa
Data Identifiers
Mindat Occurrence Record ID:49525
Long-form Identifier:1:3:49525:3
GUID (UUID V4):0
Nearest other occurrences of Sturmanite
1.3km (0.8 miles) ⓘN'Chwaning III Mine, N'Chwaning Mines, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa
3.0km (1.9 miles) ⓘWessels Mine, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa
3.1km (1.9 miles) ⓘN'Chwaning II Mine, N'Chwaning Mines, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa
3.7km (2.3 miles) ⓘN'Chwaning I Mine, N'Chwaning Mines, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa
References
Peacor, D. R., Dunn, P. J., Duggan, M. (1983) Sturmanite, a ferric iron, boron analogue of ettringite. The Canadian Mineralogist, 21 (4) 705-709
Hochleitner, Rupert (1986) Sturmanit und Ettringit aus den Kalahari-Manganfeldern [Sturmanite and Ettringite from the Kalahari manganese fields]. Lapis, 11 (10) 19-24
Pohl, Demetrius, Bezing, K.L. Von, Dixon, Roger D., Cavallo, Greg (1991) The Kalahari Manganese Field [South Africa]: an Update. The Mineralogical Record, 22 (4) 279-297
Cairncross, B., Dixon, R. (1995) Minerals of South Africa. Geological Society of South Africa. p.1-290.pp.244-245
 
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