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=0.685 from S. Jose de Safira, Minas Gerais, Brazil
Sample: Annealed at T = 600 C for t = 20 m
Note: Occupancies calculated assuming complete Fe/Mn disorder
_database_code_amcsd 0003852
14.2445 5.7265 5.0789 90 90 90 Pbcn
atom       x      y      z  occ  Uiso
FeA        0 .32929    .25 .625 .0074
NbA        0 .32929    .25 .207 .0074
MnA        0 .32929    .25 .165 .0074
TaA        0 .32929    .25 .003 .0074
NbB  .162846 .17715 .74782 .846 .0062
FeB  .162846 .17715 .74782 .083 .0062
TaB  .162846 .17715 .74782 .049 .0062
MnB  .162846 .17715 .74782 .022 .0062
O1    .09502 .10630  .0721      .0088
O2    .41991 .11684  .0944      .0094
O3    .75624 .12194  .0828      .0080