AM_Richterite_19 Formula: Si8 (Mg2.96 Ni2.04) Ca1.12 Na2.64 O24 Name: Richterite Unit cell: 9.9024 17.965 5.2603 90.0 104.361 90.0 , V=906.55 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: Ni40