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Rare earths in some niobate-tantalates

Published online by Cambridge University Press:  14 March 2018

J. R. Butler
J. R. Butler*
Affiliation:
Imperial College, South Kensington, London, S.W. 7
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Summary

Rare-earth distribution has been determined for fourteen niobatetantalates containing essential rare earths. Those minerals with more than about 15 % TiO2 (and corresponding to either priorites or members of the euxenite-polycrase series) have Yt as the dominant rare earth with the heavier lanthanons in excess of the lighter lanthanons. Those minerals with less than about 4 % TiO2 and less than about 30 % (Yt,Ln)2O3 (and corresponding to samarskites) also have Yt as the dominant rare earth but they show a marked concentration of Gd + Tb + Dy over the other lanthanons. It is tentatively suggested that this power of selective lanthanon enrichment may be characteristic of samarskite among the niobate-tantalates examined.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 31 , Issue 240 , March 1958 , pp. 763 - 780
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1958

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