Natural hydrated aluminium oxide. There are several varieties of this mineralviz.. a white quality containing some 6o per cent, alumina, a little iron, and no silica, which is used for making aluminium salts and alum; a red variety of about the same alumina content but containing little silica, used for manufacturing metallic aluminium; and another white kind containing only 45 per cent, alumina and much silica, v.hich is used more for making refractories.
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