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Title
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Transformation of chernikovite into parsonsite and study of its solubility product
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Author
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Abstract
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| Chernikovite, (H3O)2(UO2)(PO4)2.6H2O, was synthetically prepared from schoepite, UO2(OH)2.2H2O, and transformed into synthetic parsonsite Pb2(UO2) (PO4)2 . nH2O by ion exchange with Pb2+-ions. Chemical analysis of synthetic parsonsite yields a composition Pb2(UO2)(PO4)2-0.5H2O that is quite identical with natural parsonsite. The crystals are pale yellow and not fluorescent. The space group is P1BAR and the cell parameters are: a = 6.8487 angstrom +/- 0.0002, b = 10.3599 angstrom +/- 0.0004, c = 6.6712 angstrom +/- 0.0002. alpha = 101.843-degrees +/- 0.003, beta = 98.233-degrees +/- 0.003, gamma = 86.361-degrees +/- 0.003. For a cell volume of 456.5 angstrom 3 a formular weight of 874.7 and measured density of 6.21 g/cm3 a value of Z = 1.96 is calculated. The X-ray powder pattern shows the following ten strongest lines: 3.396(60), 3.276(55), 3.247(60), 3.232(80), 3.152(90), 3.082(70), 3.009(70), 2.9272(90), 2.7870(60), 2.7630(100). |
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Language
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English
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Source (journal)
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Neues Jahrbuch für Mineralogie: Monatshefte. - Stuttgart
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Publication
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Stuttgart
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1991
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ISSN
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0028-3649
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Volume/pages
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12
(1991)
, p. 551-558
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ISI
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A1991HC36600003
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