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Corkite from Aggeneys, Bushmanland, South Africa

Published online by Cambridge University Press:  05 July 2018

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

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.

Type
Mineralogy and Petrology
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1990

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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