Lithium Fluoride, CAS 7783-40-6, has the formula MgF2. Magnesium Fluoride is used as a flux in the metalurgy of magnesium metal, as an additive in fluxes for porcelain and pottery, as a coating agent for titanium pigments, and as a phosphor in cathode ray screens. In its pure form, it is used as an anti-glare agent in optical lens coatings.