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