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On the occurrence of niobium-tantalum and other rare-element minerals in the Meldon aplite, Devonshire

Published online by Cambridge University Press:  05 July 2018

Oleg von Knorring  and
Eric Condliffe
Oleg von Knorring
Affiliation:
Department of Earth Sciences, The University, Leeds LS2 9JT
Eric Condliffe
Affiliation:
Department of Earth Sciences, The University, Leeds LS2 9JT
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Abstract

A number of rare-element minerals from the Meldon aplite are described, e.g. native arsenic and antimony, arsenolite, stibiconite, and various niobium-tantalum minerals. Some of the minerals are new to the occurrence and some may be new to the British Isles. Particular attention has been paid to the Nb-Ta minerals and a large number of electron-microprobe analyses for manganocolumbite, manganotantalite, and microlite are presented. Examination of numerous, minute crystals and fragments of columbite-tantalite revealed a complex oscillatory zoning, indicating a slow rate of cooling and perhaps incomplete miscibility of the isomorphous columbite-tantalite series.

Type
Research Article
Information
Mineralogical Magazine , Volume 48 , Issue 348 , September 1984 , pp. 443 - 448
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1984

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