铝在地壳中约占7.5%,是常见元素之一,它几乎只成为含氧化合物和铝硅酸盐存在。铝的氧化物是铝硅酸盐经风化水解后转变成为三水铝矿,一水硬铝石及一水软铝石等水化程度不同的氧化铝矿物或氢氧化物,通常称这类矿物为铝土矿。但铝土矿中经常伴生有高岭石等的铝硅酸盐,如广西某铝土矿中除高岭石外还含有绿泥石和水白云母, Aluminum accounts for about 7.5% of the earth’s crust, and is one of the most common elements that almost exclusively exist as oxygenates and aluminosilicates. Aluminum oxide is the aluminosilicate after weathering hydrolysis into gibbsite, a diaspore and boehmite and other hydration degree of alumina minerals or hydroxides, usually called such minerals For bauxite. However, bauxite often accompanied by kaolinite and other aluminosilicates, such as a bauxite in Guangxi in addition to kaolinite also contains chlorite and water muscovite,