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The bauxite (red-brown solid) - aluminium oxide mixed with impurities-is extracted from the earth. The extracted aluminium oxide is then treated with alkali, to remove the impurities. This results in a white solid called aluminium oxide or alumina.
Bauxite, an aluminium ore, is the world's main source of aluminium. It consists mostly of the minerals gibbsite (Al(OH) 3), boehmite (Î³-AlO(OH)) and diaspore (Î±-AlO(OH)), mixed with the two iron oxides goethite and haematite, the clay mineral kaolinite and small amounts of anatase (TiO 2) and ilmenite (FeTiO 3 or FeO.TiO 2).