Tags: Chemical Substance, Mineral.
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 end member formula is CaMn2+(CO3)2 but magnesium Mg and iron Fe2+ commonly substitute for manganese Mn2+ with the Mn content varying from 38% to 84% so the formula Ca(Mn2+MgFe2+)(CO3)2 better represents the species.
