Lowenstein's rule extended to an aluminum rich framework. Ca-8(Al2SiO6)(4)(OH)(8), by MASNMR and neutron diffraction.

The structure of the aluminum rich framework material Ca-8(Al2SiO6)(4)(OH)(8), as studied by powder neutron diffraction and MASNMR, shows long range disordering of the silicon and aluminum but local avoidance of Si-O-Si links. This distribution of silicon in the framework also minimizes the number of Al-O-Al linkages in accordance with Lowenstein's rule. The structure also contains four hydroxide groups per sodalite cage which are weakly bonded, in disordered positions, to the framework oxygen.