Colorless granular solid, slightly soluble in dilute acid, almost insoluble in water (18 ℃, and 87 mg/L), melting point 1261 ℃, boiling point 2260 ℃.Supply the purity of 99.99%, which is used to grow magnesium fluoride single crystal or manufacturing fluxing agent in the production of ceramics, glass, metal smelting magnesium lens, optical instrument.