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Determination of minerals in platinum concentrates from the Transvaal by X-ray methods

Published online by Cambridge University Press:  14 March 2018

F. A. Bannister
F. A. Bannister*
Affiliation:
Mineral Department of the British Museum of Natural History
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Extract

Concentrates from the platiniferous norites of the Bushveld, Transvaal, are not completely soluble in aqua regia. The insoluble portion consists of steel-grey fragments first analysed chemically by R. A. Cooper and considered by him to be a new platinum mineral represented by the formula Pt(As,S)2. The name cooperite was proposed for the new mineral by F. Wartenweiller, and after further work Cooper decided that the arsenic found in the early analysis was due to the presence of sperrylite, and he changed the formula to PtS2. H. Schneiderhöhn observed simple twinning and, less frequently, polysynthetie lamellae on polished sections of mineral grains from the same deposits, and he suggested that cooperite is probably orthorhombic and isomorphous with marcasite. The latest account of the new mineral has been published by H. R. Adam who gave several analyses of cooperite from the Rustenburg and Potgietersrust districts and concluded that the ‘mineral is PtS2 with a small amount of excess metal (platinum, palladium, and nickel) present in solid solution’.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 23 , Issue 138 , September 1932 , pp. 188 - 206
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1932

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References

page 188 note 1 Cooper, R. A., Journ. Metall Mining Soc. South Africa, 1928, vol. 28, p. 281.Google Scholar [Min. Abstr., 4-10.]

page 188 note 2 In the discussion on Cooper's paper. See also Min. Mag., 1931, vol 21, p. 618.

page 188 note 3 Cooper, R. A., Journ. Metalh Mining Soc. South Africa, 1929, vol. 29, p. 230Google Scholar (final discussion to the preceding paper).

page 188 note 4 H. Schneiderhöhn, Centr. Min., Abt. A, 1929, p. 193. [M.A. 4-149.] H. Schneiderhöhn and P. Ramdohr, Lehrbuch der Erzmikroskopie, Berlin, 1931, voh 2, p. 216.

page 188 note 5 H. R. Adam, Trans. Geol. Soc. South Africa, 1931, vol. 33 (for 1930), p. 103. [M.A. 4-500.] See also discussion in Proc. Geol. Soc. South Africa, 1932, Trans. vol. 34 (for 1931), pp. xxxv and xlii.

page 190 note 1 Communicated in a letter.

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page 205 note 1 The methods used were those of F. Roessler, Zeits. Anorg. Chem., 1895, voh 9, p. 31; R. Schneider, Ann. Phys. Chem. (Poggendorff), 1870, vol. 141, p. 519; L. N. Vauquelin, Ann. Chem. Phys., 1813, vol. 88, p. 190; and Smith and Keller, Ber. Deut. Chem. Gesell., 1890, vol. 23, p. 3373.

page 205 note 2 H. Deville and H. Debray, Compt. Rend Acad. Sci. Paris, 1879, vol. 89, p. 587.

page 205 note 3 Dana Syst. Min., 6th edit., 1892, p. 93; L. J. Spencer in Sir Edward Thorpe's Dictionary of Applied Chemistry, 2nd edit. (London), 1924, vol. 4, p. 38 ; W. F. de Jong and A. ttoog, Rec. Tray. Chim. Pays-Bas, 1927, vol. 46, p. 173

page 205 note 4 H. E. Roscoe and C. Schorlemmer, Treatise on Chem., 4th edit. (London), 1907, vol. 2, p. 1291 ; A. J. Webb, in Sir Edward Thorpe's Dictionary of Applied Chemistry, 2nd edit. (London), 1924, vol. 5, p. 721.