Dolomite: CaMg(CO3)2: Mineral: Dolomite Exporter: Dolomite ...
Dolomite''s symmetry class is bar 3 whereas the Calcite Group''s symmetry class is bar 3 2/m. The loss of symmetry allows only simple crystal forms to be used by the Dolomite Group minerals, mostly rhombohedrons. Dolomite is a very common mineral and ankerite is much more scarce.