AM_Richterite_3 Formula: Si8 (Mg1.78 Ni3.22) (Na Ca) K O24 H2 Name: Richterite Unit cell: 10.0436 17.962 5.2633 90.0 104.936 90.0 , V=917.44 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: KNi60, Atomic parameters from ICSD