AM_Richterite_22 Formula: Si8 Ni5 Ca1.02 Na2.98 O24 Name: Richterite Unit cell: 9.8927 17.926 5.2534 90.0 104.48 90.0 , V=902.03 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: Ni100