| Reference Type | Journal (article/letter/editorial) |
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| Title | The aqueous chemistry of uranium minerals. Part 2. Minerals of the liebigite group |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Alwan, Alwan K. | Author |
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| Williams, Peter A. | Author |
| Year | 1980 (March) | Volume | 43 |
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| Issue | 329 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_43/43-329-665.pdf+ |
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| DOI | doi:10.1180/minmag.1980.043.329.17Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 3111 | Long-form Identifier | mindat:1:5:3111:4 |
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| GUID | 0 |
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| Full Reference | Alwan, Alwan K., Williams, Peter A. (1980) The aqueous chemistry of uranium minerals. Part 2. Minerals of the liebigite group. Mineralogical Magazine, 43 (329) 665-667 doi:10.1180/minmag.1980.043.329.17 |
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| Plain Text | Alwan, Alwan K., Williams, Peter A. (1980) The aqueous chemistry of uranium minerals. Part 2. Minerals of the liebigite group. Mineralogical Magazine, 43 (329) 665-667 doi:10.1180/minmag.1980.043.329.17 |
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| In | (1980, March) Mineralogical Magazine Vol. 43 (329) Mineralogical Society |
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| Abstract/Notes | SynopsisFree energies of formation of liebigite, Ca2UO2 (Co3)3·10H2O, swartzite, CaMgUO2(Co3)3·12H2O, bayleyite, Mg2UO2(CO3)3·18H2O, and andersonite, Na2CaUO2(CO3)3·6H2O have been determined from solution studies at various temperatures. ΔGf(298.2K)° values for the above minerals are −6226±12, −6607±8, −7924±8 and −5651±24 KJ mol−1 respectively. ΔH0f(298.2K) values respectively are −7037±24, −7535±20, −9192±20, and −5916±36 kJ mol−1. These results have been used to construct the stability diagram for the four minerals shown in fig. I. Andersonite can only form when the activity of the sodium ion, aNa+, is relatively high and aCa2+ and aMg2+ are small. The interconversions of the sodium-free species are defined. When aMg2+/aCa2+ < 0.32 liebigite is the stable phase. If aMg2+/aCa2+ > 7.94, bayleyite forms preferentially. One might therefore expect the bayleyite-andersonite association to be more common than liebigite-andersonite, but this is entirely dependent upon the relative concentrations of Mg2+(aq) and Ca2+(aq) in the solutions from which the minerals form. |
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