Bauxite is a sedimentary rock composed mainly of aluminum hydroxide minerals. It is the primary ORE of aluminum and is also known as ALUMINA. Bauxite is an ORE, which means it is a MINERAL deposit that contains a large enough concentration of a particular MINERAL to make it economically feasible to extract. Bauxite is a MINERAL composed of various elements, including iron, silicon, titanium, and oxygen. It is a common source of aluminum, which is used in many products, such as cars, airplanes, and electronics. Bauxite is also used in the production of cement and other building materials.