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 ncp1, T = 293 K
_database_code_amcsd 0001436
14.221 5.727 5.102 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 .3327   .25 .271 1.25 0.0090 0.0115 0.0105      0  0.001      0
TaA       0 .3327   .25 .091 1.25 0.0090 0.0115 0.0105      0  0.001      0
FeA       0 .3327   .25 .638 1.25 0.0090 0.0115 0.0105      0  0.001      0
NbB  .16391 .1725 .7462 .614  .49 0.0049 0.0076 0.0062 -.0002  .0000  0.001
TaB  .16391 .1725 .7462 .205  .49 0.0049 0.0076 0.0062 -.0002  .0000  0.001
FeB  .16391 .1725 .7462 .181  .49 0.0049 0.0076 0.0062 -.0002  .0000  0.001
O1    .0941  .107  .072       0.7
O2    .4211  .117  .090       0.4
O3    .7577  .120  .082       0.6