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

Locality type:Mine
Classification
Species:Gaudefroyite
Formula:Ca4Mn3+2-3(BO3)3(CO3)(O,OH)3
Comments:Largest crystals were up to 5cm, specimens of 1cm are common. Associated minerals are andradite, calcite, ettringite, hausmannite and hematite.

The bronze hair-like specimens have been found in association with baryte, calcite, gypsum, hausmannite and hematite.
Habit:Prismatic, hair-like, fibrous.
Colour:Black, copper-brown
Quality for species:Excellent - world class for species or very significant. (!!)
Confirmation
Validity:Believed Valid
References
References:Cairncross, B., and Dixon, R., (1995) Minerals of South Africa. The Geological Society of South Africa, Linden 2014, RSA; Gutzmer, J. (1996). Genesis and alteration of the Kalahari and Postmasburg manganese deposits, Griqualand West, South Africa (Doctoral dissertation, Rand Afrikaans University); Cairncross, B., and Beukes, N. J., (2013) The Kalahari Manganese Field, the adventure continues. Struik Nature Publishers, Cape Town, South Africa
Associated Minerals:
Associates:Baryte
Hausmannite
Associated Minerals Based on Photo Data:
Andradite22 photos of Gaudefroyite associated with Andradite at this locality.
Hausmannite15 photos of Gaudefroyite associated with Hausmannite at this locality.
Calcite11 photos of Gaudefroyite associated with Calcite at this locality.
Baryte9 photos of Gaudefroyite associated with Baryte at this locality.
Ettringite9 photos of Gaudefroyite associated with Ettringite at this locality.
Thaumasite5 photos of Gaudefroyite associated with Thaumasite at this locality.
Hematite3 photos of Gaudefroyite associated with Hematite at this locality.
Sturmanite2 photos of Gaudefroyite associated with Sturmanite at this locality.
Data
Mineral Data:Click here to view Gaudefroyite data
Locality Data:Click here to view N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese field, Northern Cape Province, South Africa
Nearest other occurrences of Gaudefroyite
0.6km (0.3 miles) A N'Chwaning I Mine, N'Chwaning Mines, Kuruman, Kalahari manganese field, Northern Cape Province, South Africa
12.3km (7.7 miles) B Wessels Mine, Hotazel, Kalahari manganese field, Northern Cape Province, South Africa
Mineral and/or Locality  
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