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).