AM_Richterite_7 Formula: Si8 (Mg3.02 Co1.98) (Na Ca) K O24 H2 Name: Richterite Unit cell: 10.0817 18.021 5.2753 90.0 104.832 90.0 , V=926.49 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: KCo40, Atomic parameters from ICSD