Alumina, also known as aluminum oxide, is an oxide of aluminum. It's commonly used as an abrasive and in making ceramics and refractories.
Bauxite: The primary ore from which aluminum is extracted; it contains a high percentage of alumina.
Corundum: A crystalline form of aluminum oxide and one of the rock-forming minerals.
Refractory Materials: Materials that can withstand high temperatures without melting or breaking down; alumina is often used in these materials.