Hostname: page-component-78c5997874-m6dg7 Total loading time: 0 Render date: 2024-11-05T04:24:07.419Z Has data issue: false hasContentIssue false
  • English
  • Français

Corkite from Aggeneys, Bushmanland, South Africa

Published online by Cambridge University Press:  05 July 2018

H. de Bruiyn ,
W. A. Van Der Westhuizen ,
G. J. Beukes  and
T. Q. Meyer
H. de Bruiyn
Affiliation:
Department of Geology, University of the Orange Free State, PO Box 339, Bloemfontein 9300, South Africa
W. A. Van Der Westhuizen
Affiliation:
Department of Geology, University of the Orange Free State, PO Box 339, Bloemfontein 9300, South Africa
G. J. Beukes
Affiliation:
Department of Geology, University of the Orange Free State, PO Box 339, Bloemfontein 9300, South Africa
T. Q. Meyer
Affiliation:
Department of Geology, University of the Orange Free State, PO Box 339, Bloemfontein 9300, South Africa
Get access Rights & Permissions [Opens in a new window]

Abstract

Corkite associated with plumbojarosite and goethite occurs in gossan and iron-formation at Black Mountain and Broken Hill, Aggeneys. Electron microprobe analyses indicate that there are two groups of corkite present in the area; one with high Cu and low (PO4)3− and the other with low Cu and high (PO and the other with low Cu and high (PO4)3− contents. This can be explained in terms of the general formula contents. This can be explained in terms of the general formula AB2(XO4)2(OH)6, where the incorporation of divalent ions in the B site is accompanied by the exchange of trivalent anions by divalent ones to retain charge balance. Complete solid-solution is inferred between (SO4)2−and (PO4)3− end members, indicating that the jarosite and beudantite groups form part of the same solid-solution series. The distribution of Zn in corkite also reflects the regional distribution of zinc grades in the area, becoming more zinc-rich from west to east. New X-ray diffraction parameters are also presented which update existing data.

Keywords

corkiteEMP analysessolid-solution seriesX-ray diffraction dataBushmanlandSouth Africa
Type
Mineralogy and Petrology
Information
Mineralogical Magazine , Volume 54 , Issue 377 , December 1990 , pp. 603 - 608
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1990

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.)

References

Appleman, D. E., Evans, H. T., and Handwerker, D. S. (1972) Geol. Surv. Computer Contribution, 20, Geol. and Comp. Centre Divisions, Washington, DC, Program no. W9214, 26 pp.Google Scholar
Colliston, W. P., Praekelt, H. E., and Schoch, A. E. (1989) A broad perspective (Haramoep) of geological relations established by sequence mapping in the Proterozoic Aggeneys terrane, Bushmanland, South Africa. S. Afr. J. Geol. 92, 42-8.Google Scholar
Fransolet, A. M., Jedwab, J., and Van Tassel R. (1977) Mineraux secondaries plombif6res (cerusite, anglesite, pyromorphite, corkite et wulfenite) de Richelle, Belgique. Ann. Soc. Geol. Belg. 100, 1-7.Google Scholar
Giuseppetti, G. and Tadini, C. (1987) Corkite, PbFe3(SO4) (PO4) (OH)6, its crystal structure and ordered arrangement of the tetrahedral cations. Neues Jahrb. Mineral. Mh., 71-81.Google Scholar
Hiemstra, S. A. (1956) An easy method to obtain X-ray diffraction patterns of small amounts of material. Am. Mineral. 41, 519-21.Google Scholar
Jambor, J. L. and Dutrizac, J. E. (1983) Beaverite–plumbojarosite solid solutions. Can, Mineral. 21, 101-13.Google Scholar
Jambor, J. L. (1985) The synthesis of beaverite. Ibid. 23 47-51.Google Scholar
Meyer, T. Q. (1986) The mineralogy and geochemistry of some of the iron-formations of Bushmanland. Unpubl. M.Sc. thesis, Univ. Orange Free State, Bloemfontein, South Africa, 193 pp.Google Scholar
Jambor, J. L., Van der Westhuizen, W. A., Beukes, G. J., De Bruiyn, H., and Schoch, A. E. (1986) An occurrence of the hydrous lead–copper–iron silicate creaseyite in South Africa. Mineral. Mag. 50, 346-8.Google Scholar
Nambu, M., Tanida, K. and Kano, S. (1964) Corkite from the Osarizawa Mine, Akita Prefecture. Japan Assoc. Mineral. Petrol. Econ. Geol. 52, 113-21.CrossRefGoogle Scholar
Scott, K. M. (1987) Solid solution in, and classification of, gossan-derived members of the alunite-jarosite family, northwest Australia. Am. Mineral. 72, 178-87.Google Scholar
Taguchi, Y., Kizawa, Y. and Okada, N. (1972) On beaverite from the Osai-izawa Mine. Kobutsugaki Zasshi (Japan), 10, 313-25.Google Scholar
Van Wambeke, L. (1971) Hinsdalite and corkite: indicator minerals in Central Africa. Mineral. Deposita, 6, 130-2.CrossRefGoogle Scholar