Calcium Carbonate

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The molecular structure of Calcium Carbonate
It is formed by the combination of calcium ions (Ca²⁺) and carbonate ions (CO₃²⁻) through ionic bonds and belongs to ionic crystals.
It exists in nature in various crystal forms. Common ones include:
Calcite: Trigonal crystal system, with a compact crystal structure and a relatively high density (2.71g /cm³), is the most stable crystal form of calcium carbonate.
Aragonite: Orhombic crystal system, with a slightly higher density (2.93 g/cm³). Thermodynamically, it is less stable than calcite and can transform into calcite over a long period of time.
Vaterite: Hexagonal crystal system, rare, metastable crystal form, easily transforms into calcite or aragonite.

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