Tveitite
	Yakubovich O V, Massa W, Pekov I V, Gavrilenko P G
	Crystallography Reports 52 (2007) 71-79
	Crystal structure of tveitite-(Y): fractionation of rare-earth elements
	between positions and the variety of defects
	Locality: Rov-Gora Mountain, West Keivy, Kola Peninsula, Russia
	_database_code_amcsd 0012393
	17.020 17.020 9.679 90 90 120 R-3
	atom x y z occ Uiso
	YA1 .87106 .01720 .82517 .883 .0105
	NaA1 .87106 .01720 .82517 .11 .0105
	CaA2 .76076 .03251 .16022 .841 .0141
	NdA2 .76076 .03251 .16022 .159 .0141
	CaA3 .73790 .89618 .49980 .716 .0110
	NaA3 .73790 .89618 .49980 .204 .0110
	HoA3 .73790 .89618 .49980 .080 .0110
	CaA4 0 0 .5 .092 .0169
	NaA4 0 0 .5 .074 .0169
	F1 .8716 .0188 .5855 .0176
	F2 .7325 .8969 .7449 .0173
	F3 .8902 .1570 .7483 .0148
	F4 .7553 .0365 .4113 .0165
	F5 .7503 .0331 .9058 .0181
	F6 .8044 .9184 .9981 .72 .0271
	F7 .8898 .9032 .7646 .71 .0350
	F8 .8593 .8765 .9171 .30 .018
	F9 0 0 .929 .06 .030
	F10 0 0 .750 .10 .021
	F11 .001 .029 .973 .06 .033
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	Tveitite-(Y)
	Bevan D J M, Strahle J, Greis O
	Journal of Solid State Chemistry 44 (1982) 75-81
	The crystal structure of tveitite, an ordered yttrofluorite mineral
	Note: a and b adjusted to match reported bond lengths
	_database_code_amcsd 0013486
	16.9620 16.9620 9.6664 90 90 120 R-3
	atom x y z occ Biso
	Y .0169 .1489 .1786 .60
	Ca1 0 0 .5353 .5 2.8
	Ca2 .2654 .2348 .1557 .1
	Ca3 .1749 .4059 .1672 1.2
	F1 .1958 .0831 .0040 1.0
	F2 .1102 .0975 .2349 1.4
	F3 .0190 .1495 .4146 .1
	F4 .2702 .1024 .2573 .3
	F5 .1576 .2686 .2515 .2
	F6 .0324 .2842 .0971 .4
	F7 .2955 .3838 .0744 .3
	F8 0 0 .060 .5 1.4
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