The Gejian kaoline ore bed(ore body) either sandwiches in Laojunshan granite gneiss or is sandwiched in between Laojunshan granite gneiss.The occurrence of them is basically consistent each other.We think this kaoline deposit is formed by the kaolinization in situ of Laojunshan granite gneiss.The granite gneiss is the mother rock of the kaoline ore deposit(ore body).