Ullmannite Bayliss P American Mineralogist 62 (1977) 369-373 Crystal structure refinement of arsenian ullmannite approximate cubic structure _database_code_amcsd 0000576 5.886 5.886 5.886 90 90 90 P2_13 atom x y z occ Biso Ni -.0171 -.0171 -.0171 .97 .65 Co -.0171 -.0171 -.0171 .03 .65 S .3817 .3817 .3817 .98 .80 As .3817 .3817 .3817 .02 .80 Sb .6256 .6256 .6256 .91 .62 As .6256 .6256 .6256 .08 .62 Bi .6256 .6256 .6256 .01 .62