| Research work, up to 1974, on crystallography and crystal chemistry of the faujasite
family of zeolites has been reviewed. The nature of the aluminosilicate framework,
the intracrystalline zeolitic fluid, compositional range of the different members of this
family, and crystallographic siting of non-framework cations and water molecules in
the different cavities of the framework wherever it has been possible to do so, have
been analysed. Migration of non-framework cations consequent upon dehydration has also
been reviewed with the help of schematic diagrams and the way they would lead to activity
of the dehydrated forms, so characteristic of this family of zeolites, has been emphasized. |
