This is a beautiful thumbnail of Kutnohorite from N’chwaning Mine III , Kalahari Manganese Field, Northern Cape, South Africa
Crystal Dimension: 2.1 cm (0.83”) x 1.6 cm (0.63”)
Perky Display Box Dimension:
3.5cm (1.3”) x 3.5cm (1.3”)
Crystal Weight: 5.7 grams
Kutnohorite is a rare calcium manganese carbonate mineral with magnesium and iron that is a member of the dolomite group. It forms a series with dolomite, and with ankerite.
The chemical formula for Kutnohorite is: