AM_Richterite_67 Formula: K Mg5 (Na Ca) Si8 O24 H2 Name: Richterite Unit cell: 10.0547 17.997 5.2746 90.0 104.832 90.0 , V=922.66 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