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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

References

Berbert, C. O., (1970) Geologia dos complexos básicosultrábasicos de Goiás Anais do XXIV Cong. Bras. Geol. Soc. Bras. Geol. 41–50.Google Scholar
Bischoff, James. L., (1972) A Ferroan Nontronite from the Red Sea Geothermal System Clays and Clay Minerals 20 4 217–223.CrossRefGoogle Scholar
Brindley, G. W. and Pham Thi, H., (1973) The nature of garnierites—I: Structures, chemical compositions, and color characteristics Clays and Clay Minerals 21 27–40.CrossRefGoogle Scholar
Carmichael, I. S. E., (1970) Chemical analysis of silicate rocks .Google Scholar
Costa, J. L. G., (1970) Nickel deposits of the São José do Tocantins massif—notes on economic geology and on exploration by C. N. T. Anais do XXIV Cong. Bras. Geol. Soc. Bras. Geol. .Google Scholar
Faust, G. T., (1966) The hydrous nickel-magnesium silicates—the garnierite group Am. Miner. 51 279–298.Google Scholar
Grim, R. E., (1968) Clay Mineralogy New York McGraw-Hill.Google Scholar
Jeffery, P. G., (1970) Chemical Methods of Rock Analysis Oxford Pergamon Press 336–338.Google Scholar
Jeffery, P. G. and Wilson, A. D., (1960) A continued gravimetric and photometric procedure for determining silica in silicate rocks and minerals Analyst 85 478–485.CrossRefGoogle Scholar
Lindenmayer, D. H. Motta, J. Reis, A G L d and Araujo, V. A., (1970) Nota explicativa sobre o Macio de São José do Tocantins .Google Scholar
MacEwan, D. M. C. and Brown, G., (1961) Montmorillonite minerals The Identification and Crystal Structure of Clay Minerals London Mineralogical Soc..Google Scholar
Mungan, N. Jessen, and Frank, W., (1962) Studies in fractionated montmorillonite suspensions 11th Nat. Conf. Clays and Clay Minerals 11 282–294.Google Scholar
Pecora, W. T., (1944) Nickel-silicate and associated, nickel-cobalt-manganese-oxide deposits near São José do Tocantins, Goiás, Brazil U.S. Geol. Survey Bull 247–305.Google Scholar
Ross, C. S. and Hendricks, S. B., (1945) Minerals of the montmorillonite group U.S. Geol. Survey Prof. 23–79.Google Scholar
Uyeda, N. Pham Thi, H. and Brindley, George, W., (1973) The nature of garnierites—II: Electron-optical study Clays and Clay Minerals 21 41–50.CrossRefGoogle Scholar
Wilson, A. D., (1960) The micro-determination of ferrous iron in silicate minerals by a volumetric and a colori-metric method Analyst 85 823–827.10.1039/an9608500823CrossRefGoogle Scholar