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=0.752 from S. Jose de Safira, Minas Gerais, Brazil
Sample: Annealed at T = 700 C for t = 5 m
Note: Occupancies calculated assuming complete Fe/Mn disorder
_database_code_amcsd 0003855
14.2600 5.7293 5.0746 90 90 90 Pbcn
atom       x      y      z  occ  Uiso
FeA        0 .32897    .25 .660 .0067
MnA        0 .32897    .25 .175 .0067
NbA        0 .32897    .25 .164 .0067
TaA        0 .32897    .25 .001 .0067
NbB  .162566 .17806 .74780 .868 .0056
FeB  .162566 .17806 .74780 .066 .0056
TaB  .162566 .17806 .74780 .050 .0056
MnB  .162566 .17806 .74780 .017 .0056
O1    .09540 .10591  .0712      .0082
O2    .41965 .11679  .0949      .0093
O3    .75624 .12256  .0824      .0076