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Barium-felspars from Broken Hill, New South Wales (With Plate XIV.)

Published online by Cambridge University Press:  14 March 2018

E. R. Segnit
E. R. Segnit*
Affiliation:
Department of Geology, University of Adelaide
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Extract

At two localities on the outskirts of the township of Broken Hill—near the De Bavay shear zone, and at ‘The Piggery’—W. R. Browne reported unusual rock types rich in barium. His statement is accompanied by an analysis by H. P. White (analyst to the Mines Dept.) of one of these rocks, which contains 9·23% BaO. Subsequently S. R. Nockolds and E. G. Zies examined the felspars of the rock analysed by White with a view to ascertaining whether they are barium-containing varieties.

In view of the very high barium content of some of the occurrences now being investigated, much higher than that of the rock examined by Nockolds and Zies, a further mineralogical investigation was undertaken with the results recorded below. The rocks under examination were light-coloured gneisses containing up to 15% BaO. They are distributed as lenses and streaks in an acid gneiss. A specimen of the latter rock was analysed and found to contain only 0·09% BaO. The barium was found to occur in four felspars, one being a new variety of celsian. The minerals studied were celsian, calciocelsian, hyalophane, and barium-plagioclase. A careful search was made for other barium silicate minerals such as sanbornite, but none was found.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 27 , Issue 192 , March 1946 , pp. 166 - 174
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1946

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References

page 166 note 1 Browne, W. R., Mem. Geol. Surv. N.S.W., 1922, no. 8, appendix 1, p. 337.Google Scholar

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