Bauxite is aluminium-rich ore that is used for aluminium production (the metallurgical bauxites) and for production of refractory materials, chemicals or cements (the non-metallurgical bauxites). Bauxite have five types e. g. (1) pure gibbsitic bauxite (ii) Gibbsitic bauxite containing qua- rta (iii) Mixed gibbsitic-boehmitic bauxite (iv) Boehmi tic bauxite and (v) Diasporic bauxite. more kaolinite. Chemical Composition of Bauxite Ore: Bauxite is the most important ore of aluminum which contains only 30–54% alumina, Al2O3; the rest is a mixture of silica, various iron oxides, and titanium dioxide along with trace amounts of zinc, phosphorous, nickel, vanadium etc.