Mineral: Sturmanite
Locality: N'Chwaning II Mine, N'Chwaning mining area, Kuruman, Kalahari manganese field (KMF), Northern Cape Province, South Africa
Dimensions: 14,0 x 9,0 x 6,5 cm

Description: Main crystal size : 5,8 cm Floating group of intact amber colored translucent crystals formed around a matrix. The crystals are hexagonal prisms that are topped by a hexagonal pyramid, which in turn is truncated by the flat face of a pinacoid. The concentric zones of different colors in the crystals are due to the alternation of sturmanite and charlesite. MIM number 1609 Photographer : Augustin de Valence (Ainu)

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