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Dufrenite in iron-formation on the Kangnas farm, Aggeneys district, Bushmanland, South Africa

Published online by Cambridge University Press:  05 July 2018

W. A. Van Der Westhuizen ,
H. de Bruiyn ,
G. J. Beukes  and
D. Strydom
W. A. Van Der Westhuizen
Affiliation:
Department of Geology, University of the Orange Free State, P.O. Box 339, Bloemfontein, 9300, Republic of South Africa
H. de Bruiyn
Affiliation:
Department of Geology, University of the Orange Free State, P.O. Box 339, Bloemfontein, 9300, Republic of South Africa
G. J. Beukes
Affiliation:
Department of Geology, University of the Orange Free State, P.O. Box 339, Bloemfontein, 9300, Republic of South Africa
D. Strydom
Affiliation:
Department of Geology, University of Natal, Pietermaritzburg, Republic of South Africa
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Abstract

An occurrence of yellowish green to green dufrenite in iron-formation from Proterozoic metamorphites on Kangnas farm near Aggeneys, Bushmanland, South Africa is described. The mineral formed by reaction between iron oxides and hydroxides and a phosphate, probably apatite. It was identified by its characteristic X-ray diffraction pattern, but microprobe analyses presented here indicate that the chemical compositions are extremely variable.

Keywords

dufreniteEMP analysesProterozoic metamorphitesiron-formation
Type
Non-silicate Mineralogy
Information
Mineralogical Magazine , Volume 54 , Issue 376 , September 1990 , pp. 419 - 424
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) Indexing and least square refinement of powder diffraction data. Geologic and Computer Centre Divisions, Washington, D.C. Google Scholar
Carmiehael, I. S. E. (1967) The iron-titanium oxides of salic volcanic rocks and their associated ferromagnesian silicates. Contrib. Mineral. Petrol. 14, 36-64.CrossRefGoogle Scholar
Frondel, C. (1949) The dufrenite problem. Am. Mineral. 34, 513-40.Google Scholar
Hey, M. H. (1955) Chemical index of minerals. Second revised edition. London, 728 pp.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
Kolthoff, I. M., Sandell, E. B., Machan, E. J. and Bruchenstein, S. (1969) Quantitative chemical analyses. MacMillan, New York.Google Scholar
Meyer, T. Q. (1986) The mineralogy and geochemistry of some of the iron-formations of Bushmanland. Unpubl. M.Sc. thesis, Univ. of the O.F.S., Bloemfontein, 193 pp.Google Scholar
Moore, P. B. (1970) Crystal chemistry of the basic iron phosphates. Am. Mineral. 55, 135-69.Google Scholar
Moore, P. B. (1984) Crystallochemical aspects of the phosphate minerals. In Phosphate minerals (Nriagu, J. O. and Moore, P. B., eds.). Springer-Verlag, New York, 442 PP.Google Scholar
Nriagu, J. O. (1984) Phosphate minerals; their properties and general modes of occurrence. In Phosphate minerals (Nriagu, J. O. and Moore, P. B., eds.). Springer-Verlag, New York, 422 pp.CrossRefGoogle Scholar
Palache, C., Berman, H. and Frondel, C. (1951) The system of mineralogy. 7th ed. Vol. 2., John Wiley New York, 1124 pp.Google Scholar
Rickwood, P. C. (1966) On recasting analyses of garnet into end-member molecules. Contrib. Mineral. Petrol. 18, 175-98.CrossRefGoogle Scholar
South African Committee for Stratigraphy (SACS) (1980) Stratigraphy of South Africa. Part 1 (Comp. L. E. Kent). Lithostratigraphy of the Republic of South Africa, South West Africa/Namibia, and the Republics of Bophuthatswana, Transkei and Venda: Handb. geol. Surv. S. Aft. 8,690 pp.Google Scholar
Strydom, D. (1985) A structural-stratigraphic study of the metasediments and other metamorphites of north-western Bushmanland. Unpubl. Ph.D. thesis (in Afrikaans), Univ. of the Orange Free State, Bloemfontein, 172 pp.Google Scholar
Strydom, D., Van der Westhuizen, W. A. and Schoch, A. E. (1987) The iron-formations of Bushmanland in the north-western Cape Province, South Africa. In Precambrian Iron-Formations (Appel, P. W. and LaBerge, G. I., eds.). Theophrastus Publications, S.A. Athens, Greece, 674 pp.Google Scholar
Van der Westhuizen, W. A., Strydom, D., Schoch, A. E., Tordiffe, E. A. W. and Beukes, G. J. (1986) Petrochemical evidence on the probable origin of ferriferous metasediments in western Bushmanland. Mineral. Deposita, 21, 121-8.CrossRefGoogle Scholar
Yvon, K., Jeitschko, W. and Parthe, E. (1977) Lazy pulverix: A programme to calculate theoretical X-ray and neutron diffraction powder patterns. J. Appl. Crystallogr. 10, 73-4.CrossRefGoogle Scholar