AM_Richterite_51 Formula: Na1.58 Ca.88 Mg5 (Si1.92 Ge6.08) O24 H2 Name: Richterite Unit cell: 10.2255 18.2144 5.3683 90.0 105.555 90.0 , V=963.23 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: Ge6Ri, Si24Ge76