Kaolinite is a common phyllosilicate mineral with the chemical composition Al2Si2O5(OH)4. It is named for its type locality, Kao-Ling, Jianxi, China. It forms Kaolinite Group, members of which even belong to larger general group, Clays. Kaolinite's structure is composed of silicate sheets (Si2O5) bonded to gibbsite layers, aluminum oxide/hydroxide layers, Al2(OH)4.