Dufrenite in Iron-Formation on the Kangnas Farm, Aggeneys District, Bushmanland, South Africa

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

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: dufrenite • EMP analyses • Proterozoic metamorphites • iron-formation

Mineralogical Magazine; September 1990 v. 54; no. 376; p. 419-424; DOI: 10.1180/minmag.1990.054.376.07
© 1990, The Mineralogical Society
Mineralogical Society (www.minersoc.org)