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N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese field, Northern Cape Province, South Africa

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Latitude & Longitude (WGS84): 27° 8' 9'' South , 22° 51' 52'' East
Latitude & Longitude (decimal): -27.13611,22.86472
Other regions containing this locality:Kalahari Desert, Africa
Köppen climate type:BSh : Hot semi-arid (steppe) climate

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Mineral List

79 valid minerals. 5 (TL) - type locality of valid minerals. 2 erroneous literature entries.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

0 - 66 Ma

ID: 2233217
Kalahari Group

Age: Cenozoic (0 - 66 Ma)

Stratigraphic Name: Kalahari Group

Description: Superficial deposits comprising gravels, clays, sandstone, silcrete, calcrete and aeolian sand

Reference: Council for Geoscience. Geologic map of South Africa, 1:1M. National Science Councils of South Africa. [41]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


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Hochleitner, R. (1986) Sturmanit und Ettringit aus den Kalahari-Manganfeldern. LAPIS 11 (10), 19-24.
Beukes, G.J., De Bruiyn, H. and Van der Westhuizen, W.A. (1993) Gaudefroyite from the Kalahari manganese field, South Africa. Neues Jahrbuch Mineralogie, Monatshefte, 385–392.
Gutzmer, J. (1994) Hydrothermale Alteration von Manganerzen der Nchwaning Mine, Kalahari Manganerzfeld, Suedafrika. Diploma dissertation (unpublished). Clausthal University of Technology, 158 pages.
Gutzmer, J. (1994) Hydrothermale Alteration von Manganerzen der Nchwaning Mine, Kalahari Manganerzfeld, Suedafrika. Mitteilungsblatt. Clausthal University of Technology, 53–54.
Cairncross, B., and Dixon, R. (1995) Minerals of South Africa. The Geological Society of South Africa, Linden 2014, RSA.
Nyfeler, D., Armbruster, T., Dixon, R. and Bermanec, V. (1995) Nchwaningite, Mn2+2SiO3(OH)2•H2O, a new pyroxene related chain silicate from the Nchwaning mine, Kalahari manganese field, South Africa. American Mineralogist, 80, 377–386.
Cairncross, B., Beukes, N. and Gutzmer, J. (1997) The Manganese Adventure – The South African Manganese Fields. Associated Ore & Metal Corporation Limited, Johannesburg, Republic of South Africa.
Cairncross, B., Tsikos, H. and Harris, C. (2000) Prehnite from the Kalahari manganese field, South Africa, and its possible implications. South African Journal of Geology, 103, 231–236.
Cairncross, B., Gutzmer, J. and Pretorius, A. (2002) Spektakulärer Neufund: Poldervaartit aus der N’Chwaning II-Mine, Kalahari, Südafrika. Lapis, 27, 30–34.
Cairncross, B. (2004) Field Guide To Rocks & Minerals Of Southern Africa.
Bonazzi, P., Bindi, L., Medenbach, O., Pagano, R., Lampronti, Menchetti, S. (2007) Olmiite, CaMn[SiO3(OH)](OH), the Mn-dominant analogue of poldervaartite, a new mineral species from Kalahari manganese fields (Republic of South Africa), Mineralogical Magazine, 71, 193-291.
Cairncross, B., and Beukes, N. J., (2013) The Kalahari Manganese Field, the adventure continues. Struik Nature Publishers, Cape Town, South Africa.

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