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=0.674 from Kragero, Norway Sample: Annealed at T = 500 C for t = 15 h Note: Occupancies calculated assuming complete Fe/Mn disorder _database_code_amcsd 0003861 14.344 5.739 5.105 90 90 90 Pbcn atom x y z occ Uiso MnA 0 .32241 .25 .612 .0097 FeA 0 .32241 .25 .110 .0097 NbA 0 .32241 .25 .167 .0097 TaA 0 .32241 .25 .042 .0097 TiA 0 .32241 .25 .026 .0097 CaA 0 .32241 .25 .008 .0097 NbB .16371 .17733 .74098 .804 .0076 MnB .16371 .17733 .74098 .087 .0076 TaB .16371 .17733 .74098 .068 .0076 FeB .16371 .17733 .74098 .016 .0076 TiB .16371 .17733 .74098 .002 .0076 O1 .0959 .1041 .0632 .0140 O2 .4188 .1163 .0927 .0124 O3 .7563 .1234 .0888 .0110