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Nickeliferous Nontronite, A 15Å Garnierite, at Niquelandia, Goiás, Brazil

Published online by Cambridge University Press:  01 July 2024

Nivaldo J. Bosio ,
Vernon J. Hurst  and
Robert L. Smith
Nivaldo J. Bosio*
Affiliation:
Geology Department, University of Georgia, Athens, Georgia 30602, U.S.A.
Vernon J. Hurst
Affiliation:
Geology Department, University of Georgia, Athens, Georgia 30602, U.S.A.
Robert L. Smith
Affiliation:
Geology Department, University of Georgia, Athens, Georgia 30602, U.S.A.
*
*Now at Departamento de Geologia, Faculdade de Filosofia, Ciencias e Letras, Rio Claro, Brazil.
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Abstract

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Garnierite from the Tocantins Complex at Niquelandia, Brazil, is a 15Å, dioctahedral clay mineral, nickeliferous nontronite. The principal octahedral cations are Fe3+, Al and Ni. The ferric state of the iron has been verified by ESCA. Ni occupies both the octahedral site and an exchange site. The garnierite formed (and is still forming) by the weathering of nickeliferous pyroxenite. Although the garnierite is a secondary product of weathering, it undergoes further change as weathering progresses: Ni and silica decrease, Fe3+ and Al increase, and the color changes from bright yellow green to red brown. Eventual breakdown of the garnierite leaves mainly hydrated oxides of iron and aluminum.

Type
Research Article
Information
Clays and Clay Minerals , Volume 23 , Issue 5 , October 1975 , pp. 400 - 403
Copyright
Copyright © 1975, The Clay Minerals Society

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