| Reference Type | Journal (article/letter/editorial) |
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| Title | The chemical stability of mimetite and distribution coefficients for pyromorphite–mimetite solid-solutions |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Inegbenebor, Adedayo I. | Author |
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| Thomas, John H. | Author |
| Williams, Peter A. | Author |
| Year | 1989 (June) | Volume | 53 |
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| Issue | 371 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_53/53-371-363.pdf+ |
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| DOI | doi:10.1180/minmag.1989.053.371.12Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 1514 | Long-form Identifier | mindat:1:5:1514:5 |
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| GUID | 0 |
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| Full Reference | Inegbenebor, Adedayo I., Thomas, John H., Williams, Peter A. (1989) The chemical stability of mimetite and distribution coefficients for pyromorphite–mimetite solid-solutions. Mineralogical Magazine, 53 (371) 363-371 doi:10.1180/minmag.1989.053.371.12 |
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| Plain Text | Inegbenebor, Adedayo I., Thomas, John H., Williams, Peter A. (1989) The chemical stability of mimetite and distribution coefficients for pyromorphite–mimetite solid-solutions. Mineralogical Magazine, 53 (371) 363-371 doi:10.1180/minmag.1989.053.371.12 |
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| In | (1989, June) Mineralogical Magazine Vol. 53 (371) Mineralogical Society |
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| Abstract/Notes | AbstractThe equilibrium solubility of mimetite has been determined in aqueous solution at 298.2K. For the reaction Pb5(ASO4)3Cl(s,mimetite)+6H+(aq)⇌5Pb2+(aq)+3H2AsO4−(aq)+Cl−(aq) at this temperature log KH+, extrapolated to zero ionic strength, is equal to −27.9(4). This value is equal, within experimental error, to that corresponding to pyromorphite, Pb5(PO4)3Cl, derived from the literature, and redetermined here under analogous conditions. Distribution coefficients in terms of both HXO42− and H2XO4−(aq) ions (X = P,As) have also been determined for solid phases of the pyromorphite-mimetite solid solution series containing from 5 to 95 mol. % mimetite. Although the two end-members are isostructural without being strictly isomorphous, the solid solution series behaves ideally over the whole compositional range; that is, the composition of the solid phase reflects the ratio of arsenate to phosphate species in aqueous solution at pH values corresponding to naturally-occurring aqueous solutions generally associated with the oxidized zones of base metal orebodies. Some relationships between mimetite and other secondary lead(II) and copper(II) arsenate minerals have been explored. |
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