AM_Richterite_50 Formula: Na1.47 Ca.98 Mg5 (Si3.88 Ge4.12) O24 H2 Name: Richterite Unit cell: 10.1237 18.147 5.3386 90.0 105.067 90.0 , V=947.06 Space group: C12/M1 (12)

Senda K , Ishida K , Jenkins D M , American Mineralogist , 90 (2005) p.1062-1071, X-ray Rietveld refinement and FTIR spectra of synthetic (Si,Ge)-richterites, Sample: Ge4Ri, Si48Ge52