Hostname: page-component-cd9895bd7-dzt6s Total loading time: 0 Render date: 2024-12-29T06:45:30.215Z Has data issue: false hasContentIssue false
  • English
  • Français

The stabilities of antlefite and Cu3SO4(OH)4.2H2O: their formation and relationships to other copper(II) sulfate minerals

Published online by Cambridge University Press:  05 July 2018

A. M. Pollard ,
R. G. Thomas  and
P. A. Williams
A. M. Pollard
Affiliation:
School of Chemistry and Applied Chemistry, University of Wales College of Cardiff, P.O. Box 912, Cardiff CF1 3TB
R. G. Thomas
Affiliation:
School of Chemistry and Applied Chemistry, University of Wales College of Cardiff, P.O. Box 912, Cardiff CF1 3TB
P. A. Williams
Affiliation:
School of Chemistry and Applied Chemistry, University of Wales College of Cardiff, P.O. Box 912, Cardiff CF1 3TB
Get access Rights & Permissions [Opens in a new window]

Abstract

The stabilities of antierite, Cu3SO4(OH)4, and a synthetic compound whose stoichiometry is here established as Cu3SO4(OH)4.2H2O, have been determined at 5°C intervals between 10°C and 45°C using solution methods. The results of the experiments show that antlerite is stable with respect to the compound Cu3SO4(OH)4.2H2O only at temperatures above 30°C Below 30°C a change in the relative stabilities of these two basic copper(II) sulfates occurs, and the compound Cu3SO4(OH)4.2H2O, although unknown at present as a mineral, instead, is stable. Under these conditions, it does not react to give antlerite if kept in contact with water. Once isolated from its mother liquor, however, the dihydrate undergoes rapid dehydration to yield antlerite. Thermodynamic quantities for the two phases have been derived from equilibrium measurements. At 298.2K, values of AfG° for the compounds Cu3SO4(OH)4.2H2O(s ) and antlerite are −1919.6(14) and −1445.0(10) kJ mol−1, respectively. The results have been used to construct stability field diagrams for the system CuO—H2O–SO3 at 25°C and at 35°C These diagrams have been used to illustrate the chemical conditions under which the two compounds might be expected to form in the oxidised zones of cupriferous base metal orebodies.

Keywords

antleritesulfatesdihydratestability field diagrams
Type
Mineralogy
Information
Mineralogical Magazine , Volume 56 , Issue 384 , September 1992 , pp. 359 - 365
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1992

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Footnotes

*

Present address: Department of Archaeological Sciences, University of Bradford, Bradford, West Yorkshire BD7 1DP.

†

Present address: Department of Chemistry, University of Western Sydney, P.O. Box 10, Kingswood, N.S.W. 2747, Australia.

References

Anthony, J.E., Williams, S.A., and Bideaux, R.A. (1977) The Mineralogy of Arizona. University of Arizona Press, Tucson.Google Scholar
Arzruni, A. (1899) Zeits. Kryst. Min., 31, 229–47.Google Scholar
Baes, C.F., Jr. and Mesmer, R.E. (1976) Hydrolysis ofCations. Wiley, New York.Google Scholar
Balarew, C.H.R. and Markov, L. (1986) In Morphology and Phase Equilibria of Minerals (Bonev, I. and Kanazirski, M., eds.). IMA, Sofia.Google Scholar
Bandy, M.C. (1938) Am. Mineral., 23, 669–760.Google Scholar
Barton, P.B. and Bethke, P.M. (1960) Am. J. Sci., 258-A, 21–34.Google Scholar
Barwood, H. and Hajek, B. (1978) Mineral. Rec., 9, 388–91.Google Scholar
Bell, J.M. and Murphy, G.M. (1926) J. Am. Chem.Soc., 48, 1500–2.CrossRefGoogle Scholar
Braithwaite, R.S.W. (1982) Mineral. Rec., 13, 167–74.Google Scholar
Buttgenbach, H. (1926) Soc. gdol. Belgique, Bull., 49, 164–80.Google Scholar
Frondel, C. (1949) In: Palache, C., Berman, H., and Frondel, C. The System of Mineralogy, 7th Edition (1951), Vol. 2, p. 592. Wiley, New York.Google Scholar
Hutton, C.O. and McCraw, J.D. (1950) Trans. Roy.Soc. New Zealand, 78, 342–3.Google Scholar
Jarrell, O.W. (1944) Econ. Geol., 39, 251–86.CrossRefGoogle Scholar
Kheifets, V.L. and Rotinyan, A.L. (1954) J. Gen.Chem. U.S.S.R., 24, 93540.Google Scholar
Kokkoros, P. (1953) Tschermaks Min. Petr. Mitt., Ser. 3, 3, 295-7.Google Scholar
Komkov, A.I. and Nefedov, E.I. (1967) Zap. Vses.Mineral Obschch., 96, 58–62.Google Scholar
Palache, C., Berman, H., and Frondel, C. (1951) TheSystem of Mineralogy, 7th Edition, Vol. 2. Wiley, New York.Google Scholar
Perrin, D.D. and Sayce, I.G. (1967) Talanta, 14, 833–42.CrossRefGoogle Scholar
Posnjak, E. and Tunell, G. (1929) Am. J. Sci., Ser. 5, 18, 1-34.Google Scholar
Ridkosil, T. and Povondra, P. (1982) Casop. pro.Mineralogii a Geologii, 27, 79–84.Google Scholar
Robie, R.A., Hemingway, B.S., and Fisher, J.R. (1978) Thermodynamic Properties of Minerals andRelated Substances at 298. 15K an 1 Bar (105 Pascal)Pressure and at Higher Temperatures. U.S. Geol. Surv. Bull. 1452.Google Scholar
Silman, J.F.B. (1958) The Stabilities of Some OxidisedCopper Minerals in Aqueous Solutions at 25°C and 1Atmosphere Total Pressure. Unpublished Ph.D. thesis, Harvard University.Google Scholar
Smith, R.M. and Martell, A.E. (1976) Critical StabilityConstants, 4, Plenum, New York.Google Scholar
Ungemach, H. (1924) Bull. Soc. Min., 47, 124–9.Google Scholar
Vogel, A.L. (1961) Textbook of Quantitative InorganicAnalysis, 3rd Edition. Longmans, London.Google Scholar
Walenta, K. (1975) Aufschluss, 26, 369–411.Google Scholar
Weisbach, A. (1886) Jb. Berg.-hatt. Sachsen, 86.Google Scholar
Young, S.W. and Stearn, A.E. (1916) J. Am. Chem.Soc., 38, 1947–53.CrossRefGoogle Scholar
Zambonini, F. (1910) Mem. R. Accad. Sci. Fis. Mat.Napoli, Ser. 2, 14, 337-9.Google Scholar