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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 does not have a specific composition. It is a mixture of hydrous aluminum oxides, aluminum hydroxides, clay minerals and insoluble materials such as quartz, hematite, magnetite, siderite and goethite. The aluminum minerals in bauxite can include: gibbsite Al(OH) 3, boehmite AlO(OH), and, diaspore, AlO(OH).Bauxite is typically a soft (H:1-3), white to gray to reddish brown material with a pisolitic structure, earthy luster and a low specific gravity (SG: 2.0-2.5).auxite is found in abundance at many locations around the world. In 2010 the ten leading bauxite producing countries were: Australia, China, Brazil, India, Guinea, Jamaica, Russia, Kazakhstan, Suriname and Greece. Each of these countries has enough reserves for many years of continued production.