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Aragonite group

[ A²⁺ ][CO₃]

• [ Ca ]: Aragonite
• [ Pb ]: Cerussite
• [ Sr ]: Strontianite
• [ Ba ]: Witherite

• Polymorph: Calcite group (Trigonal), Vaterite group (Hexagonal)

• Class: Carbonate
• System: Orthorhombic