Calcium fluoride

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</table> Calcium fluoride (CaF₂) is an insoluble ioniccompound of calcium and fluorine. It occurs naturally as the mineral fluorite (also called fluorspar), and it is the source of most of the world's fluorine. It reacts with concentrated sulfuric acid to produce hydrogen fluoride: CaF₂(s) + H₂SO₄(l) → CaSO₄(s) + 2 HF(g) Calcium fluoride is commonly used as a window material when operating at infrared wavelengths as it is transparent in the IR.

General
Name	Calcium fluoride
Chemical formula	CaF2
CAS registry number	7789-75-5</sub>
Appearance	White (or colored by impurities) crystalline solid.
Physical properties
Formula weight	78.07 amu
Melting point	1675 K (1402 °C)
Boiling point	2770 K (2500 °C)
Density	3.18 ×103 kg/m3 (solid)
Solubility	virtually none in water
SI units were used where possible. Unless otherwise stated, standard conditions were used. Disclaimer and references </font>

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