Aluminium ore is commonly referred to as BAUXITE, which is a sedimentary rock composed mainly of aluminium hydroxide minerals. BAUXITE is the main source of aluminium, and is mined in many countries around the world. It is formed by the weathering of aluminium-rich rocks over millions of years, and is usually found near the surface of the earth. BAUXITE is typically processed into alumina, which is then smelted to produce aluminium metal.