which compound is used for preparation of bauxite

Bauxite is primary ore of Aluminium. It is the rock made from the laterite soil which is leached of of silica and other soluble materials in a wet tropical or subtropical climate. It is mixture of aluminum hydroxides, hydrous aluminum oxides, clay minerals, insoluble materials like- quartz, hematite, magnetite, siderite, and aluminum minerals like-goethite, gibbsite Al(OH)3, boehmite AlO(OH), and, diaspore, AlO(OH).