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Pyrosmalite in the Broken Hill lode, New South Wales1

Published online by Cambridge University Press:  14 March 2018

F. L. Stillwell  and
John McAndrew
F. L. Stillwell
Affiliation:
Melbourne, Australia
John McAndrew
Affiliation:
Melbourne, Australia
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Summary

Pyrosmalite is a widespread, though very limited, constituent of the Broken Hill lode, and is formed by the hydration and chlorination of the manganeseiron silicates. It is altered in contact with galena and eventually disintegrates into a mat of very fine fibres. The pyrosmalite varies substantially in ratio of Mn/Fe, and two specimens from the rare vughs and fractures gave on analysis ratios of 1·96 and 0·71. The refractive indices decrease slightly with increasing amounts of manganese and water, with a simultaneous small increase in the unit-cell dimensions. The name pyrosmalite is retained for the mineral species in accord with its earlier usage and its recent limitation to the iron-rich variety of an isomorphous series is not endorsed.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 31 , Issue 236 , March 1957 , pp. 371 - 380
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1957

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