AM_Richterite_17 Formula: Si8 Mg5 Ca1.05 Na2.85 O24 Name: Richterite Unit cell: 9.9076 17.988 5.2706 90.0 104.252 90.0 , V=910.41 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: Mg(100)