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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 is a rock composed mainly of Aluminium Oxide and Aluminium Hydroxide minerals. These might include: Gibbsite, Boehmite and Diaspore.The rock usually includes other materials such as Iron Hydroxide, clay, silt and free Silica. It most often occurs as a residual soil material in tropical and subtropical areas.It is the primary source of Aluminium.auxite is a rock composed mainly of Aluminium Oxide and Aluminium Hydroxide minerals. These might include: Gibbsite, Boehmite and Diaspore.