It consists mostly of the minerals gibbsite Al ( OH ) 3 , boehmite γ-AlO ( OH ) and diaspore α-AlO ( OH ) , mixed with the two iron oxides goethite and haematite , the clay mineral kaolinite and small amounts of anatase TiO2 .
It is largely made up of the minerals Gibbsite Al ( OH ) 3 , Boehmite γ-AlO ( OH ) , and Diaspore α-AlO ( OH ) , together with the iron oxides Goethite and Hematite , the clay mineral Kaolinite and small amounts of Anatase TiO2 .