AM_Richterite_26 Formula: Si8 (Mg1.13 Co3.87) Ca Na3 O24 Name: Richterite Unit cell: 9.9568 18.049 5.2742 90.0 104.413 90.0 , V=918.00 Space group: C12/M1 (12)

Della Ventura G , Robert J-L , Raudsepp M , Hawthorne F C , Welch M D , American Mineralogist , 82 (1997) p.291-301, Site occupancies in synthetic monoclinic amphiboles: Rietveld structure, refinement and infrared spectroscopy of (nickel, magnesium, cobalt)-richterite, Sample: Co80