Alumina oxide ceramics al2o3 is the most widely used fine ceramics material. Aluminum oxide al 2 o 3 ceramic properties. 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.
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