| Reference Type | Journal (article/letter/editorial) |
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| Title | A thermodynamic prediction on the stability of the nukundamite + chalcopyrite and bornite + pyrite assemblages |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Kojima, Shoji | Author |
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| Ueno, Teiichi | Author |
| Year | 1994 (June) | Volume | 58 |
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| Issue | 391 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_58/58-391-235.pdf+ |
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| DOI | doi:10.1180/minmag.1994.058.391.06Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 2027 | Long-form Identifier | mindat:1:5:2027:9 |
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| GUID | 0 |
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| Full Reference | Kojima, Shoji, Ueno, Teiichi (1994) A thermodynamic prediction on the stability of the nukundamite + chalcopyrite and bornite + pyrite assemblages. Mineralogical Magazine, 58 (391) 235-245 doi:10.1180/minmag.1994.058.391.06 |
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| Plain Text | Kojima, Shoji, Ueno, Teiichi (1994) A thermodynamic prediction on the stability of the nukundamite + chalcopyrite and bornite + pyrite assemblages. Mineralogical Magazine, 58 (391) 235-245 doi:10.1180/minmag.1994.058.391.06 |
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| In | (1994, June) Mineralogical Magazine Vol. 58 (391) Mineralogical Society |
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| Abstract/Notes | AbstractA thermodynamic prediction of the Gibbs free energy of formation (ΔGfo) of nukundamite (empirical composition Cu5.5FeS6.5) was made in order to specify whether the nukundamite + chalcopyrite or the bornite + pyrite assemblage is stable in the Cu-Fe-S system. The results of calculations using previously reported data of ΔGfo values of some Cu-Fe-sulphide minerals in equilibrium with nukundamite indicate that the total free energy of the nukundamite + chalcopyrite assemblage is appreciably higher than that of the bornite + pyrite assemblage in the temperature range 250–400°C. This means that nukundamite + chalcopyrite is a metastable assemblage under common ore-forming conditions.The occurrence of nukundamite is not uncommon in the Fijian kuroko deposits in contrast to the Japanese kuroko deposits. A thermochemical treatment for this phenomenon leads to the interpretation that the black ore containing nukundamite in the Fijian deposit was formed under relatively highsulphidation and low-pH conditions. This suggestion is in good agreement with the present experimental result that the bornite + pyrite assemblage was produced in the temperature range 350–250°C by using near-neutral hydrothermal solutions. |
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