Used as an abrasive in sandpapers and grinding wheels due to its hardness. Commonly found in cutting tools and polishing compounds. Serves as a catalyst support in chemical reactions. Applied in protective coatings for metals to enhance corrosion resistance. Used in the production of refractory materials because of its high melting point. Found in dental implants and medical prosthetics as a biocompatible material. Utilized in electronics as a dielectric layer in integrated circuits. Also used in the manufacture of spark plugs and high-pressure sodium lamps.