This is a beautiful thumbnail of Kutnohorite from N’chwaning Mine III , Kalahari Manganese Field, Northern Cape, South Africa
Crystal Dimension: 2cm (0.8”) x 1.7 cm (0.69”)
Perky Display Box Dimension:
3.5cm (1.3”) x 3.5cm (1.3”)
Crystal Weight: 5.6 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: