The formula for aluminum oxide is Al2O3. It is a white solid with a molar mass of 101.96 grams per mole and a density of 3.95 to 4.1 grams per cubic centimeter. Its melting point is 3,762 degrees Fahrenheit, and its boiling point is 5,391 degrees Fahrenheit.
Aluminum oxide occurs naturally in minerals such as corundum. It does not conduct electricity, but it conducts heat. It is insoluble in water. It is obtained industrially from bauxite ore. It is used as a filler for plastics, as a catalyst or catalyst support, as an abrasive because of its hardness, and as a refractory material because of its high melting point.