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