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On Tapiolite in the Pilbara goldfield, Western Australia1

Published online by Cambridge University Press:  14 March 2018

Edward S. Simpson
Edward S. Simpson*
Affiliation:
Geological Survey of Western Australia
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Extract

The Pilbara goldfield lies in the north-west division of Western Australia within the tropics, and has been described in considerable detail by A. Gibb Maitland in Bulletin 40 of the Geological Survey of Western Australia. Though the chief mineral product at present is gold, the district abounds in other economic minerals, notably ores of copper and tin, and has already become famous as being by far the most important producer of tantalum in the world, the chief source of supply of this metal being the manganotantalite of Wodgina.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 18 , Issue 84 , June 1917 , pp. 107 - 121
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1917

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Footnotes

1

Published by permission of A. Gibb Maitland, Government Geologist.

References

page 107 note 2 Bulletins and Annual Reports of the Geological Survey of Western Australia, and Transactions of Aust. Assoc. Adv. Science.

page 108 note 1 The name and formulae ascribed to these minerals are dealt with fully in a paper on the tapiolite group now in course of preparation.

page 109 note 1 Woolnough, W. G., Proc. R. Soc. N. S. W., 1901, vol. xxxv, p. 352Google Scholar.

page 109 note 2 Headden, W. P. and Pirsson, L. V., Amer. gourn. Sci., 1891, vol. xli, p. 249 Google Scholar.

page 109 note 3 Warron, C. H., Amer. Aourn. Sci., 1898, vol. vi, p. 121 Google Scholar.

page 109 note 4 Laeroix, A., Bull. Soc. franc. Min., 1919, vol. xxxv, pp. 187–191 Google Scholar.

page 109 note 5 The faces of the rotated half of the twin are bracketed.

page 110 note 1 For comparison of Ungemach's and Lacroix's figures with those in the present paler.

page 111 note 1 Warren, C. H., Amer. Journ. Sci., 1898, vol. vi, p. 121 Google Scholar.

page 111 note 2 Zambonini, F., Mineralogical Magazine, 1908, vol. xv, p. 79Google Scholar.

page 111 note 3 Lacroix, A., Bull. Sci. franc. Min., 1912, vol. xxxv, p. 186 Google Scholar.

page 111 note 4 Ungemach, H., ibid., 1916, vol. xxxix, p. 8Google Scholar.

page 111 note 5 Quoted by Hintze, , Handbuch d. Min, 1907, vol. i, p. 1611Google Scholar.

page 111 note 6 a2d2=68° a2(a4) - 65° 46'.

page 114 note 1 Or corresponding pair of faces.

page 114 note 2 The angle a2(a1).

page 115 note 1 W. T. Schaller does not accept CaTa2O6 s as isomorphous with MnTa2O6 and FeTa2O6 s. W. T. Schaller, 'The rutile group,' U.S. Geol. Survey, Bull. 509, 1912, pp. 10-18, 19-20.

page 118 note 1 Dana's 'System of Mineralogy ', 6th edit., 1892, p. 788.

page 118 note 2 C. H. Warren, loc. cit.

page 118 note 3 Prior, G. T., Doelter's Handbueh der Mineralchemie, 1913, vol. iii, p. 264Google Scholar.

page 118 note 4 D'Achiardi, G., ibid., 1918, vol. iii, p. 27Google Scholar.

page 118 note 5 Crook, T. and Johnstone, S. J., Mineralogical Magazine, 1912, vol. xvi, p. 231Google Scholar.

page 118 note 6 Schaller, W. T., U.S. Geol. Survey, Bull. 509, 1912, p. 11Google Scholar.

page 119 note 1 W. T. Schaller, loc. cit., omits these proved calcium isomorphs from his list and fails to take the lime and magnesia into consideration in discussing my analysis of Wodgina ixiolite. On the other hand, he includes FeTiO3, Whose only claim to existence as a tetragonal compound, except the very doubtful 'iserite ', are some analyses of rutile and nigrine in which neither Nb2O5 nor Ta2O5 nor V2O5 have been looked for, though all three are probably present, and lastly analyses of ilmenorutile and striiverite in which the relative figures for Ta2O5, Nb2O5, and TiO2 are not absolutely above suspicion, and of which in any case a different interpretation, not involving FeTiO3, is possible. The present author contends on theoretical grounds that FeTiO3 cannot be iso. morphous with the series of compounds here discussed.

page 121 note 1 In the discussion following the reading of this paper, Dr. G. T. Prior remarked that since the publication of his own results (this Magazine, 1908, vol. xv, p. 80) he had realized that, with the small amounts of material at his disposal, the Marignac method for the separation of tantalic and niobic acids gave in all probability results much too low for tantalie acid. Until accurate methods or the separation of tantalic and niobic acids have been devised, the position in the striiverite-ilmenorutile series of the minerals he then analysed is best given by the density and percentage of titanium dioxide, the general accuracy of the data for which there is no reason to doubt.