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The relationship between euhedral and framboidal pyrite in base-metal sulphide ores

Published online by Cambridge University Press:  05 July 2018

Joseph Ostwald  and
Brian M. England
Joseph Ostwald
Affiliation:
The Broken Hill Proprietary Company Limited, Central Research Laboratories, ShortlandNew South WalesAustralia
Brian M. England
Affiliation:
The Broken Hill Proprietary Company Limited, Central Research Laboratories, ShortlandNew South WalesAustralia
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Summary

Specimens of layered baryte containing a range of pyrite forms, including framboids, framboidal aggregates, spherulites, polyhedra, and zoned euhedral crystals from Kempfield, New South Wales, Australia, have been examined by mineragraphy, X-ray diffraction (XRD), X-ray fluorescence (XRF), and electron-probe microanalysis (EPMA). These investigations showed that the pyrite occurred in two forms—an arsenical variety containing approximately 5% arsenic in solid solution within the pyrite and a non-arsenical variety. EPMA studies indicate that the framboids and the cores of the zoned euhedral crystals have similar levels of arsenic and a genetic relationship is deduced to exist between these forms.

Type
Research Article
Information
Mineralogical Magazine , Volume 43 , Issue 326 , June 1979 , pp. 297 - 300
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1979

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