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Calcite group

[ A²⁺ ][CO₃]

• [ Ca ]: Calcite
• [ Ni ]: Gaspéite, Gaspeite
• [ Co ]: Spherocobaltite
• [ Mg ]: Magnesite
• [ Cd ]: Otavite
• [ Mn ]: Rhodochrosite
• [ Fe ]: Siderite
• [ Zn ]: Smithsonite

• Polymorph: Aragonite group (Orthorhombic), Vaterite group (Hexagonal)

• Class: Carbonate
• System: Trigonal