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Notes on a new occurrence of stilpnomelane from North Wales

Published online by Cambridge University Press:  14 March 2018

D. W. Matthews  and
J. H. Scoon
D. W. Matthews
Affiliation:
Department of Mineralogy and Petrology, Cambridge
J. H. Scoon
Affiliation:
Department of Mineralogy and Petrology, Cambridge
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Summary

An occurrence of stilpnomelane in calcite veins cutting an Ordovician sedimentary iron-ore body has yielded good material for optical and chemical study; data for both ferro- and ferri-stilpnomelane are presented. Associated pyrrhotine, ilmenite, and apatite are briefly described, and a chemical analysis of the apatite shows it to be an extremely pure fluorapatite.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 33 , Issue 266 , September 1964 , pp. 1032 - 1037
Copyright
Copyright © 1964, The Mineralogical Society

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