AM_Richterite Formula: Si8 Mg5 (Na Ca) K 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)

Della Ventura G , Robert J-L , Raudsepp M , Hawthorne F C , American Mineralogist , 78 (1993) p.633-640, Site occupancies in monoclinic amphiboles: Rietveld structure refinement of, synthetic magnesium cobalt potassium richterite, Sample: KNi0, Atomic parameters from ICSD