AM_Richterite_4 Formula: Si8 (Mg.93 Ni4.07) (Na Ca) K O24 H2 Name: Richterite Unit cell: 10.0382 17.954 5.261 90.0 104.954 90.0 , V=916.06 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: KNi80, Atomic parameters from ICSD