Notes on a New Occurrence of Stilpnomelane from North Wales

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

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.

Mineralogical Magazine; September 1964 v. 33; no. 266; p. 1032-1037; DOI: 10.1180/minmag.1964.033.266.11
© 1964, The Mineralogical Society
Mineralogical Society (