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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.
Aluminium production starts with the raw material bauxite. Bauxite is a mineral found mostly in a belt around the equator. Bauxite, containing 15-25 percent aluminium, is the only ore that is used for commercial extraction of aluminium today. The bauxite occurs mostly in the tropics, in horizontal layers normally beneath a few meters of overburden. The layers are usually mixed with various clay minerals, iron oxides and titanium dioxide. It is the iron that gives bauxite a deep red color.