Columbite-(Mn) 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: KRA n4 Qm=0.742 from Kragero, Norway Sample: Annealed at T = 530 C for t = 92 h Note: Occupancies calculated assuming complete Fe/Mn disorder _database_code_amcsd 0003862 14.334 5.737 5.096 90 90 90 Pbcn atom x y z occ Uiso MnA 0 .32200 .25 .648 .0098 NbA 0 .32200 .25 .123 .0098 FeA 0 .32200 .25 .116 .0098 TaA 0 .32200 .25 .044 .0098 TiA 0 .32200 .25 .028 .0098 CaA 0 .32200 .25 .008 .0098 NbB .16367 .17764 .74094 .826 .0076 MnB .16367 .17764 .74094 .069 .0076 TaB .16367 .17764 .74094 .067 .0076 FeB .16367 .17764 .74094 .012 .0076 TiB .16367 .17764 .74094 .002 .0076 O1 .0962 .1037 .0627 .0135 O2 .4191 .1155 .0928 .0125 O3 .75668 .1233 .0891 .0102