Abstract
A classification for tectosilicates is proposed on the basis of the chemical nature of the T atoms in [ TO 4] tetrahedra, framework density and the nature of voids in the framework. In addition, a nomenclature for clathrate type tectosilicates is proposed which is based on polyhedral building units from which the tetrahedral frameworks can be generated by linkage through common corners, edges, faces and/or additional oxygen atoms. The proposed nomenclature gives information on the framework topology, symmetry and the distribution of the guest molecules in various cages of the framework. This nomenclature may be applicable to other clathrate type compounds with tetrahedral frameworks.
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