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Tantal-aeschynite, a new mineral of the aeschynite group from the Borborema region, north-eastern Brazil

Published online by Cambridge University Press:  05 July 2018

Maria S. Adusumilli ,
C. Kieft  and
E. A. J. Burke
Maria S. Adusumilli
Affiliation:
Department of Geosciences, University of Brasilia
C. Kieft
Affiliation:
Netherlands Organization for the Advancement of Pure Research
E. A. J. Burke
Affiliation:
Institute of Earth Sciences, Free University, Amsterdam
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Summary

Tantal-aeschynite occurs as idiomorphic metamict crystals in the Raposa pegmatite at São José do Sabugí, Paraíba State, NE. Brazil. Morphological data, microscopic properties, and differential thermal analysis results are given. Electron-microprobe analyses yielded a formula: {Ca0·28(Yt,Ln)0·425(Th,U)0·11}(Ta0·75Ti0·62Nb0·595Fe0·05)O6. Yttrium is the predominant rare-earth element, with cerium and neodymium as most abundant lanthanides. The tantal-aeschynite unit cell has (after heating) a 5·34, b 10·97, c 7·38 Å. An indexed X-ray powder pattern (similar to that of aeschynite) is presented.

Type
Research Article
Information
Mineralogical Magazine , Volume 39 , Issue 305 , March 1974 , pp. 571 - 576
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1974

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