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Columbite from the Carrock Fell tungsten deposit

Published online by Cambridge University Press:  05 July 2018

B. Beddoe-Stephens  and
N. J. Fortey
B. Beddoe-Stephens
Affiliation:
Applied Mineralogy Unit, Institute of Geological Sciences, 64-78 Gray's Inn Road, London, WC1X 8NG
N. J. Fortey
Affiliation:
Applied Mineralogy Unit, Institute of Geological Sciences, 64-78 Gray's Inn Road, London, WC1X 8NG
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Abstract

Minute crystals of columbite occur in tungstate ore in the quartz veins at Carrock Fell Mine. Accompanying wolframite crystals show pronounced niobium enrichment adjacent to growth faces. The columbite grains, however, occur as inclusions in minerals formed during metasomatic replacement of the wolframite. They are chemically variable, containing 7–18 % WO3 by weight, up to 1.9% Sc2O3, and up to 4.7% TiO2. Tin, a common minor element in columbite, was not detected. The columbite grains are spatially associated with carbonate minerals involved in wolframite replacement, and it is suggested that their formation occurred principally when carbonate precipitation caused a reduction in the stability of dissolved niobium complexes.

Type
Research Article
Information
Mineralogical Magazine , Volume 44 , Issue 334 , June 1981 , pp. 217 - 223
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1981

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