Fluorspar (fluorite; florspar) CaF2.
Natural calcium fluoride; color yellow, green, or purple crystals; Mohs hardness 4, d 3.2, mp 1350C.
Grade: Metallurgical, ceramic and acid, containing more than 85 and 98% CaF2, respectively. Occurrence: US, Canada, Europe, Mexico.
Use: Principal source of fluorine and its com- pounds by way of hydrogen fluoride, flux in hearth steel furnaces and in metal smelting, in I ceramics, for synthetic cryolite, in carbon electrodes, emery wheels, electric arc welders, certain cements, dentifrices, phosphors, paint pigment, catalyst in wood preservatives, optical equipment.