Difluorides are chemical compounds with two fluorine atoms per molecule (or per formula unit).
Metal difluorides are all ionic. The alkaline earth difluorides are all insoluble in water except for beryllium difluoride. Many transition metal fluorides are water soluble though.
Calcium difluoride is a notable compound. In the form of the mineral fluorite it is the major source of commerical fluorine. It also has an epynomic crystal structure, which is an end member of the spectrum starting from bixbyite and progressing through pyrochlore. The compound has extremely high lattice stability and is thus insoluble in water despite being strongly ionic.
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Examples of the difluorides include:
Compounds of the form MF2:
Compounds of the form MF(HF):