... polymorphs: bayerite, doyleite and nordstrandite. Closely related are aluminium oxide hydroxide, AlO(OH), and aluminium oxide, Al2O3, differing only by ... components of the aluminium ore bauxite. Freshly precipitated aluminium hydroxide forms gels, which is the basis for application of ... .Uses:Annual production is some 100 million tonnes, over 90% of which is converted to aluminium oxide (alumina) ...