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**Chemical name:** Calcium carbonate
**Formula:** CaCO₃
**Molar mass of compound CaCO₃:** 100,087 g/mol
**Hardness:** 3
**Crystal system:** Rhombohedral system
**Arrangement of atoms:** Planar coordination group CO₃ and calcium ions in a six-membered coordination with oxygen.
**Crystal habit:** Columnar, rhombohedral or scalenohedral type
**Information:** Calcite is a mineral formed by crystallization of magma and hydrothermal fluids. Calcite forms a rock limestone (marble) or travertine. Depending on the mixture it has different colours. Limpid calcite is called Icelandic limestone.
**Use:** It is used for the production of lime, cement or as a building block. Icelandic limestone is used as a polarizing prism.