Notes on a new occurrence of stilpnomelane from North Wales

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 ana...

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Bibliographic Details
Published in:Mineralogical magazine and journal of the Mineralogical Society (1867-1968) 1964-09, Vol.33 (266), p.1032-1037
Main Authors: Matthews, D. W., Scoon, J. H.
Format: Article
Language:English
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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.
ISSN:0369-0148
DOI:10.1180/minmag.1964.033.266.11