AM_Richterite_49 Formula: Na1.54 Ca.9 Mg5 (Si5.96 Ge2.04) O24 H2 Name: Richterite Unit cell: 10.0144 18.071 5.3058 90.0 104.625 90.0 , V=929.08 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: Ge2Ri, Si74Ge26