Description
Kutnohorite is a rare calcium manganese carbonate mineral with magnesium and iron, a member of the dolomite group. It forms a series with dolomite, and with ankerite. The final member formula is CaMn2+(CO3)2,[5] but magnesium Mg and iron Fe2+ are commonly substituted for manganese Mn2+, the Mn content ranging from 38% to 84%, so the formula Ca(Mn2+, Mg, Fe2+)(CO3)2 better represents the species. It was named by Professor Bukowsky in 1901 after the location of Kutna Hora, Bohemia, in the Czech Republic. It was originally spelled "kutnahorite" but "kutnohorite" is the current IMA-approved spelling. Kutnohorite typically occurs in manganese-bearing sediments, associated with rhodochrosite, aragonite, and calcite. Notable occurrences include Tuscany, Italy, and Kutna Hora, Czech Republic. It likely occurs at the Trepca Mines, Stari Trg, Kosovo, in the Balkans. At the Eldorado Mine, Ouray County, Colorado, United States, it occurs as small white crystals partially encrusting quartz and dolomite. At the Ryujima Mine, Nagano Prefecture, Japan, magnesian kutnohorite occurs with quartz and rhodochrosite.
Mines in the world.
