AM_Richterite_69 Formula: K Mg5 (Na Sr) Si8 O24 H2 Name: Richterite Unit cell: 10.1534 18.115 5.2723 90.0 105.421 90.0 , V=934.82 Space group: C12/M1 (12)

Robert J-L , Della Ventura G , Raudsepp M , Hawthorne F C , European Journal of Mineralogy , 5 (1993) p.199-206, Rietveld structure refinement of synthetic strontium-rich potassium-richterites