The aluminum minerals in bauxite can include gibbsite AlOH 3, boehmite AlOOH, and, diaspore, AlOOH. Physical Properties of Bauxite. Bauxite is typically a soft material with a hardness of only 1 to 3 on the Mohs scale. It is white to gray to reddish brown with a pisolitic structure, earthy luster and a low specific gravity of between 2.0.
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