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  1. Chief ore of commercial aluminum. A mineraloid mixture of hydrous aluminum oxides.
    Source: Leet, L. Don. 1982. Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
  2. An off-white, grayish, brown, yellow, or reddish brown rock composed of amorphous or microcrystalline aluminum oxides and oxyhydroxides, mainly gibbsite Al(OH)3 , bayerite Al(OH)3 , boehmite AlO(OH) , and diaspore AlO(OH) admixed with free silica, silt, iron hydroxides, and esp. clay minerals; a highly aluminous "laterite." It is massive, pisolitic, earthy; occurs as weathered surface deposits after prolonged leaching of silica from aluminous rocks under tropical to subtropical weathering, also transported deposits. Bauxite is the chief ore of aluminum.
    Source: Dictionary of Mining, Mineral, and Related Terms

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