Clara, M., Magalhães, F., de Jesus, Julio Pedrosa, Williams, Peter A. (1986) Stability constants and formation of Cu(II) and Zn(II) phosphate minerals in the oxidized zone of base metal orebodies. Mineralogical Magazine, 50 (355) 33-39 doi:10.1180/minmag.1986.050.355.05
Reference Type | Journal (article/letter/editorial) | ||
---|---|---|---|
Title | Stability constants and formation of Cu(II) and Zn(II) phosphate minerals in the oxidized zone of base metal orebodies | ||
Journal | Mineralogical Magazine | ISSN | 0026-461X |
Authors | Clara, M. | Author | |
Magalhães, F. | Author | ||
de Jesus, Julio Pedrosa | Author | ||
Williams, Peter A. | Author | ||
Year | 1986 (March) | Volume | 50 |
Page(s) | 33-39 | Issue | 355 |
Publisher | Mineralogical Society | ||
Download URL | https://rruff.info/doclib/MinMag/Volume_50/50-355-33.pdf+ | ||
DOI | doi:10.1180/minmag.1986.050.355.05Search in ResearchGate | ||
Mindat Ref. ID | 3811 | Long-form Identifier | mindat:1:5:3811:3 |
GUID | 1f3a3344-86fe-417d-a0aa-d044144d7aab | ||
Full Reference | Clara, M., Magalhães, F., de Jesus, Julio Pedrosa, Williams, Peter A. (1986) Stability constants and formation of Cu(II) and Zn(II) phosphate minerals in the oxidized zone of base metal orebodies. Mineralogical Magazine, 50 (355) 33-39 doi:10.1180/minmag.1986.050.355.05 | ||
Plain Text | Clara, M., Magalhães, F., de Jesus, Julio Pedrosa, Williams, Peter A. (1986) Stability constants and formation of Cu(II) and Zn(II) phosphate minerals in the oxidized zone of base metal orebodies. Mineralogical Magazine, 50 (355) 33-39 doi:10.1180/minmag.1986.050.355.05 | ||
In | (1986, March) Mineralogical Magazine Vol. 50 (355) Mineralogical Society | ||
Abstract/Notes | AbstractThe free energies of formation of the minerals libethenite, Cu2PO4OH, pseudomalachite, Cu5(PO4)2(OH)4, cornetite, Cu3PO4(OH)3, tarbuttite, Zn2PO4OH, spencerite, Zn2PO4OH · 1.5H2O, and scholzite, CaZn2(PO4)2 · 2H2O, have been determined at 298.2 K using solution techniques. The values of ΔfG° (298.2 K) for the above minerals are, respectively, −1228.8±3.0, −2840.3±4.2, −1600.9±5.9, −1632.1±4.0, −1982.4±3.1, and −3556.7±7.6 kJ mol−1. These results, together with others from the literature concerning hopeite, Zn3(PO4)2·4H2O, hydroxyapatite, Ca5(PO4)3(OH), and the synthetic salt Cu3(PO4)2 · 2H2O have been used to construct a model for the formation of suites of Zn(II) and Cu(II) phosphate minerals found in the oxidation zone of base metal orebodies. The distributions and modes of occurrence of many natural assemblages of these minerals are readily explained by the model. Particular attention has been focused on deposits at Broken Hill, Zambia, and Saginaw Hill, Arizona, USA. |
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