Ferrocolumbite 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 0003834 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