Columbite-(Fe) Wenger M, Armbruster T, Geiger C A American Mineralogist 76 (1991) 1897-1904 Cation distribution in partially ordered columbite from the Kings Mountain pegmatite, North Carolina sample NCP5, T = 100 K _database_code_amcsd 0001435 14.189 5.727 5.120 90 90 90 Pbcn atom x y z occ Biso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) NbA 0 .3328 .25 .346 1.25 .0155 .0165 .0154 0 .0007 0 TaA 0 .3328 .25 .115 1.25 .0155 .0165 .0154 0 .0007 0 FeA 0 .3328 .25 .539 1.25 .0155 .0165 .0154 0 .0007 0 NbB .16456 .17114 .7473 .578 1.057 .0157 .0131 .0114 -.0003 .0002 .0007 TaB .16456 .17114 .7473 .192 1.057 .0157 .0131 .0114 -.0003 .0002 .0007 FeB .16456 .17114 .7473 .230 1.057 .0157 .0131 .0114 -.0003 .0002 .0007 O1 .0920 .110 .076 1.15 .016 .012 .015 -.002 -.001 .001 O2 .4216 .117 .090 1.10 .015 .013 .014 .000 .001 -.004 O3 .7560 .1191 .084 1.15 .017 .012 .015 .002 .003 -.002