AM_Richterite_20
Formula: Si8 (Mg1.95 Ni3.05) Ca1.07 Na2.79 O24
Name: Richterite
Unit cell: 9.8956 17.948 5.2567 90.0 104.413 90.0 , V=904.24
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: Ni60