Sewardite
	Roberts A C, Cooper M A, Hawthorne F C, Criddle A J, Stirling J A R
	The Canadian Mineralogist 40 (2002) 1191-1198
	Sewardite, CaFe2(AsO4)2(OH)2, the Ca-analogue of carminite,
	from Tsumeb, Namibia: Description and crystal structure
	Locality: Tsumeb, Namibia
	_database_code_amcsd 0005788
	16.461 7.434 12.131 90 90 90 Cccm
	atom x y z Uiso
	Ca1 0 0 1/4 .0185
	Ca2 1/4 3/4 0 .0101
	Fe .37896 .1321 .13404 .0056
	As1 .04504 .7447 0 .0054
	As2 .21374 0 1/4 .0048
	O1 .0144 .2246 .1119 .005
	O2 .0885 .529 0 .006
	O3 .1219 -.114 0 .012
	O4 .1511 .1777 .2389 .011
	O5 .2720 -.0150 .1378 .005
	OH6 .1711 .233 0 .005
	OH7 .4243 0 1/4 .017
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