It is found in nature as corundum in emery topaz amethyst and emerald and as the precious gemstones ruby and sapphire but it is from the more abundant ores such as bauxite cryolite and clays that the material is commercially extracted and purified. Variations are possible among various commercial grades. Aluminium oxide al 2 o 3 or alumina is one of the most versatile of refractory ceramic oxides and finds use in a wide range of applications.
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