- Chief ore of commercial
aluminum. A mineraloid mixture of hydrous aluminum
Source: Leet, L. Don. 1982.
Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
- 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.
Dictionary of Mining, Mineral, and Related Terms