AM_Na75Si6Al6O24S45_5D2O Formula: Na1.875 (Si1.5 Al1.5) O6.125 S1.125 H4 Name: Na7.5Si6Al6O24S4.5*.5D2O Unit cell: 9.0338 9.0338 9.0338 90.0 90.0 90.0 , V=737.24 Space group: I-43M (217)

Tarling S E , Barnes P , Klinowski J , Acta Crystallographica, Section B , 44 (1988) p.128-135, The structure and Si,Al distribution of the ultramarines, Note: disordered synthetic counterpart to lazurite, Note: occupancies changed to match formula