AM_Richterite_8 Formula: Si8 (Mg2.08 Co2.92) (Na Ca) K O24 H2 Name: Richterite Unit cell: 10.0923 18.032 5.2742 90.0 104.829 90.0 , V=927.85 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: KCo60, Atomic parameters from ICSD