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
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