Used as an abrasive in grinding and cutting tools due to its hardness. Common in sandpapers, grinding wheels, and polishing compounds. Serves as a catalyst support in chemical reactions, especially in petroleum refining. Employed in the production of aluminum metal through electrolysis. Used in ceramics and refractory materials because of high thermal stability. Found in dental implants and medical prosthetics as a biocompatible coating. Applied in electronics as a dielectric material in integrated circuits. Also used in sunscreen and cosmetics for its UV filtering and thickening properties.