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=0.714 from S. Jose de Safira, Minas Gerais, Brazil Sample: Annealed at T = 650 C for t = 20 m Note: Occupancies calculated assuming complete Fe/Mn disorder _database_code_amcsd 0003832 14.2501 5.7263 5.0767 90 90 90 Pbcn atom x y z occ Uiso FeA 0 .32898 .25 .640 .0069 NbA 0 .32898 .25 .188 .0069 MnA 0 .32898 .25 .169 .0069 TaA 0 .32898 .25 .003 .0069 NbB .162739 .17765 .74783 .856 .0057 FeB .162739 .17765 .74783 .075 .0057 TaB .162739 .17765 .74783 .049 .0057 MnB .162739 .17765 .74783 .020 .0057 O1 .09526 .10613 .0714 .0085 O2 .41987 .11665 .0942 .0093 O3 .75626 .12201 .0822 .0078