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=0.960 from Kragero, Norway Sample: Annealed at T = 800 C for t = 15 m Note: Occupancies calculated assuming complete Fe/Mn disorder _database_code_amcsd 0003866 14.380 5.750 5.084 90 90 90 Pbcn atom x y z occ Uiso MnA 0 .32024 .25 .761 .0063 FeA 0 .32024 .25 .136 .0063 TiA 0 .32024 .25 .033 .0063 TaA 0 .32024 .25 .023 .0063 CaA 0 .32024 .25 .009 .0063 NbA 0 .32024 .25 .004 .0063 NbB .162783 .17929 .73941 .885 .0041 TaB .162783 .17929 .73941 .078 .0041 MnB .162783 .17929 .73941 .011 .0041 FeB .162783 .17929 .73941 .002 .0041 O1 .09794 .0999 .0582 .0080 O2 .41751 .1158 .0961 .0087 O3 .75611 .1255 .0901 .0062