AM_Slawsonite Formula: (Sr.87 Ca.13) (Si2 Al2) O8 Name: Slawsonite Unit cell: 8.888 9.344 8.326 90.0 90.33 90.0 , V=691.46 Space group: P121/A1 (14)

Griffen D T , Ribbe P H , Gibbs G V , American Mineralogist , 62 (1977) p.31-35, The structure of slawsonite, a strontium analog of paracelsian