Hostname: page-component-cd9895bd7-gbm5v Total loading time: 0 Render date: 2024-12-27T07:28:10.905Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access Rights & Permissions [Opens in a new window]

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Adusumilli, (M. S.), 1968. Jorn. Min. (Recife),, 6, 1I-25.Google Scholar
Adusumilli, (M. S.) and RAO, (A. B.), 1962. Arquiv. Geol. Univ. Recife,, 2, I-9.Google Scholar
[Aleksandrov, (V. B.), Eskova, (E. M.), and Zhabin (A. G.)] Translated 1966 as Geochemistry and mineralogy of rare elements and genetic types of their deposits.Vol. II. Mineralogy of rare elements.Jerusalem (Israel Program for Scientific Translations).Google Scholar
Duncumb, (P.) and Reed, (S. J. B.), 1968. N.B.S. Spec. Publ. No. 298, 133-54.Google Scholar
Heinrich, (K. F. J.), 1966. In The Electron Microprobe,, 296-378.Google Scholar
Kerr, (P. F.) and Holland, (H. D.), 195I. Amer. Min., 36, 563–72.Google Scholar
[Kornetova, (V. A.), Aleksandrov, (V. B.), and Kazakova, (M. E.)] , CCCP (Proc. Min.Mus. Acaa. Sci. USSR), 14, 108-21. Refer. in: handb. Min., c. hintze, Ergänzungsband III, 1968, 317-18.Google Scholar
Levinson, (A. A.), 1966. Amer. Min., 51, 152–8.Google Scholar
Rolee, (P. A. M. A.), 1946. Boletim DFPM, 78, 2378.Google Scholar
Springer, (G.), 1967. Fortschr. Min., 45, l03-24.Google Scholar
[Zhabin, (A. G.), Aleksandrov, (V. B.), Kazakova, (M. E.), and Felchchev, (V. G.) , (Compt. Rend. Acad. Sci. URSS), 143,686-9 (English trans. DokL Acad. Sci. USSR (Earth Sci. Sect.),, 1964, 143, 86-9).Google Scholar