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=0.988 from S. Jose de Safira, Minas Gerais, Brazil Sample: Annealed at T = 950 C for t = 3 h Note: Occupancies calculated assuming complete Fe/Mn disorder _database_code_amcsd 0003859 14.2852 5.7361 5.0574 90 90 90 Pbcn atom x y z occ Uiso FeA 0 .32904 .25 .785 .0059 MnA 0 .32904 .25 .207 .0059 NbA 0 .32904 .25 .008 .0059 NbB .161550 .18024 .747862 .945 .0041 TaB .161550 .18024 .747862 .051 .0041 FeB .161550 .18024 .747862 .003 .0041 MnB .161550 .18024 .747862 .001 .0041 O1 .09692 .10376 .0692 .0059 O2 .41864 .11713 .0977 .0077 O3 .75587 .12388 .0814 .0061