Bauxite "An off-white, grayish, brown, yellow, or reddish-brown rock composed of a mixture of various amorphous or crystalline hydrous aluminum oxides and aluminum hydroxides (principally gibbsite, some boehmite and diaspore), along with free silica, silt, iron hydroxides, and esp. clay minerals;…It is a common residual or transported constituent of clay deposits in tropical and subtropical regions, and occurs in concretionary, compact, earthy, pisolitic, or oolitic forms. Bauxite is the principal commercial source of aluminum.
Bauxite was first discovered by a French chemist, P. Berthier, in 1821 while investigating specimens found near Les Baux in southern France. The rock name bauxite was not used until many years later.