Calcite (variety manganoan calcite) - N'Chwaning mining area, South Africa - 70 mm x 55 mm x 47 mm
Mineral: Calcite (variety manganoan calcite)
Locality: N'Chwaning mining area, Kuruman, Kalahari manganese field (KMF), Northern Cape Province, South Africa
Dimensions: 70 mm x 55 mm x 47 mm