Columbite-(Fe)
Tarantino S C, Zema M
American Mineralogist 90 (2005) 1291-1300
Mixing and ordering behavior in manganocolumbite-ferrocolumbite solid solution:
A single-crystal X-ray diffraction study
Sample: BRA n18 Qm=0.759 from S. Jose de Safira, Minas Gerais, Brazil
Sample: Annealed at T = 700 C for t = 20 m
Note: Occupancies calculated assuming complete Fe/Mn disorder
_database_code_amcsd 0003856
14.2658 5.7299 5.0748 90 90 90 Pbcn
atom       x       y      z  occ  Uiso
FeA        0  .32883    .25 .664 .0065
MnA        0  .32883    .25 .175 .0065
NbA        0  .32883    .25 .161 .0065
NbB  .162499 .178229 .74783 .870 .0052
FeB  .162499 .178229 .74783 .063 .0052
TaB  .162499 .178229 .74783 .050 .0052
MnB  .162499 .178229 .74783 .017 .0052
O1    .09553  .10546  .0708      .0079
O2    .41954  .11696  .0949      .0088
O3    .75613  .12263  .0820      .0074