AM_Richterite_9 Formula: Si8 (Mg1.18 Co3.82) (Na Ca) K O24 H2 Name: Richterite Unit cell: 10.1065 18.052 5.2743 90.0 104.844 90.0 , V=930.14 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: KCo80, Atomic parameters from ICSD