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**Molecular formula:** CaF₂
**Molar mass:** 78,07 g/mol
**Information:** Calcium fluoride is a colourless crystalline substance insoluble in water. It is an ionic compound composed of a calcium cation Ca²⁺ and a fluoride anion F⁻.
**Use:** It is a significant source of hydrogen fluoride (CaF₂ + H₂SO₄ → CaSO₄ + 2 HF). It is commonly used as a material for optical purposes (lens manufacture).
**Occurrence:** In nature, fluorite occurs in the form of a mineral.