Richterite Della Ventura G, Robert J-L, Raudsepp M, Hawthorne F C, Welch M D American Mineralogist 82 (1997) 291-301 Site occupancies in synthetic monoclinic amphiboles: Rietveld structure refinement and infrared spectroscopy of (nickel, magnesium, cobalt)-richterite Sample: Ni100 _database_code_amcsd 0001880 9.8927 17.926 5.2534 90 104.480 90 C2/m atom x y z occ Si1 .2795 .0857 .2978 Si2 .2879 .1702 .8065 Ni1 0 .0882 .5 Ni2 0 .1768 0 Ni3 0 0 0 Ca4 0 .2741 .5 .51 Na4 0 .2741 .5 .49 NaA 0 .4783 0 O1 .1111 .0862 .2141 O2 .1152 .1689 .7272 O3 .1067 0 .7102 O4 .3581 .2476 .7772 O5 .3475 .1307 .1023 O6 .3400 .1122 .5999 O7 .3424 0 .3000