Gypsum from selected localities.
South Africa | |
| Peacor, D. R., Dunn, P. J., & Duggan, M. (1983) Sturmanite, a ferric iron, boron analogue of ettringite. Canadian Mineralogist, 21, 705-709. |
| Von Bezing, K.L., Dixon, R.D., Pohl, D., Cavallo, G. (1991) The Kalahari (Afrique du Sud) manganese field: an update. The Mineralogical Record: 22(3): 279-302. |
Cairncross, B., Dixon, R. (1995) Cairncross, B., Dixon, R. (1995) Minerals of South Africa. Geological Society of South Africa, PO Box 44283, Linden 2104, South Africa. |
N'Chwaning II Mine, N'Chwaning Mines, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa