AM_Richterite_27 Formula: Si8 Co5 Ca.94 Na3.06 O24 Name: Richterite Unit cell: 9.9724 18.069 5.2775 90.0 104.261 90.0 , V=921.65 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: Co100