Locality: N’Chwaning II Mine, N’Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape, South Africa
Size: 62 mm x 37 mm x 34 mm (2.4 in. x 1.5 in. x 1.3 in.)
Weight: 176 g (6.2 oz.)
This is a nice specimen of dark gray/black braunite II crystals to 9 mm on massive braunite II. The crystals have a sub-metallic luster and striated faces. Braunite II is not an approved IMA name, but it is used to distinguish the calcium-bearing form of braunite.