AM_Richterite_24 Formula: Si8 (Mg2.85 Co2.15) Ca1.1 Na2.66 O24 Name: Richterite Unit cell: 9.9312 18.015 5.2731 90.0 104.245 90.0 , V=914.41 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: Co40