Kaolinite

Kaolinite (pronunciation: /ˈkeɪəlᵻˌnaɪt/) is a clay mineral, part of the group of industrial minerals, with the chemical composition Al₂Si₂O₅(OH)₄. It is a layered silicate mineral, with one tetrahedral sheet of silica (SiO₄) linked through oxygen atoms to one octahedral sheet of alumina (AlO₆) octahedra. Rocks that are rich in kaolinite are known as kaolin or china clay.