A natural aggregate of aluminum-bearing minerals, more or less
impure, in which the aluminum occurs largely as hydrated oxides. It is usually
formed by prolonged weathering of aluminous rocks.
White cream, Yellow, Brown, Gray, or Red.
hardness 1-3. Insoluble in water; decomposed by hydrochloric acid. Non
Most important ore of aluminum, aluminum chemicals, abrasives, aluminous
cement, refractory, decolorizing and deodorizing agent, catalysts, filler in
rubber, plastics, paints, cosmetics, hydraulic fracturing.