| Reference Type | Journal (article/letter/editorial) |
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| Title | The chemical stability of mendipite, diaboleïte, chloroxiphite, and cumengéite, and their relationships to other secondary lead(II) minerals |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Alun Humphreys, D. | Author |
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| Thomas, John H. | Author |
| Williams, Peter A. | Author |
| Symes, Robert F. | Author |
| Year | 1980 (September) | Volume | 43 |
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| Issue | 331 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_43/43-331-901.pdf+ |
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| DOI | doi:10.1180/minmag.1980.043.331.13Search in ResearchGate |
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| Generate Citation Formats |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 3164 | Long-form Identifier | mindat:1:5:3164:0 |
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| GUID | 0 |
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| Full Reference | Alun Humphreys, D., Thomas, John H., Williams, Peter A., Symes, Robert F. (1980) The chemical stability of mendipite, diaboleïte, chloroxiphite, and cumengéite, and their relationships to other secondary lead(II) minerals. Mineralogical Magazine, 43 (331) 901-904 doi:10.1180/minmag.1980.043.331.13 |
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| Plain Text | Alun Humphreys, D., Thomas, John H., Williams, Peter A., Symes, Robert F. (1980) The chemical stability of mendipite, diaboleïte, chloroxiphite, and cumengéite, and their relationships to other secondary lead(II) minerals. Mineralogical Magazine, 43 (331) 901-904 doi:10.1180/minmag.1980.043.331.13 |
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| In | (1980, September) Mineralogical Magazine Vol. 43 (331) Mineralogical Society |
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| Abstract/Notes | The chemical stabilities of mendipite, Pb3O2Cl2, diaboleïte, Pb2CuCl2(OH)4, chloroxiphite, Pb3CuCl2O2(OH)2, and cumengéite, Pb19Cu24Cl42 (OH)44, have been determined in aqueous solution at 298.2 K. Values of standard Gibbs free energy of formation, ΔGf°, for the four minerals are −740, −1160, −1129, and −15163±20 kJ mol−1 respectively. These values have been used to construct the stability diagram shown in fig. I which illustrates their relationships to each other and to the minerals cotunnite, PbCl2, paralaurionite, PbOHCl, and litharge, PbO. This diagram shows that mendipite occupies a large stability field and should readily form from cold, aqueous, mineralizing solutions containing variable amounts of lead and chloride ions, and over a broad pH range. The formation of paralaurionite and of cotunnite requires a considerable increase in chloride ion concentration, although paralaurionite can crystallize under much less extreme conditions than cotunnite. The encroachment of the copper minerals on to the stability fields of those mineral phases containing lead(II) only is significant even at very low relative activities of cupric ion. Chloroxiphite has a large stability field, and at given concentrations of cupric ion, diaboleïte is stable at relatively high aCl−. Cumengéite will only form at high concentrations of chloride ion. |
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