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N'Chwaning 2 Mine, Kalahari Manganese Fields, South Africa. 30mm x 20mm.
N'Chwaning 2 Mine, Kalahari Manganese Fields, South Africa. 50mm x 40mm.
N'Chwaning 2 Mine, Kalahari Manganese Fields, South Africa. 75mm x 30mm.
N'Chwaning 2 Mine, Kalahari Manganese Fields, South Africa. 40mm x 30mm.
Skorpion Mine, Namibia. 90mm x 65mm.
Tsumeb Mine, Namibia. 85mm x 25mm.