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The effect of aluminium on the infra-red spectra of 7 Å trioctahedral minerals1

Published online by Cambridge University Press:  05 July 2018

Carlos J. Serna
Affiliation:
Department of Agronomy, Purdue University West Lafayette, Indiana 47907
Joe L. White
Affiliation:
Department of Agronomy, Purdue University West Lafayette, Indiana 47907
Bruce N. Velde
Affiliation:
Laboratoire de Petrographie, Faculté des Sciences, 9 Qual Saint-Bernard, Paris 5me , France

Summary

The substitution of 2A13+ for Si4+ +M2+ (M = Mg or Ni) has been studied by infra-red spectroscopy in 7 Å trioctahedral minerals over the composition range from Al = 0.00 to Al = 2.00. Significant differences are observed in the infra-red spectra and these make possible an estimation of the amount of Al in tetrahedral coordination. The most striking effect of the substitution is observed in the stretching vibrations of the outer hydroxyl groups and that of the silicate anion.

The aluminous Mg-serpentines can be readily distinguished from their analogues, the aluminous Niserpentines, by the absence of the Mg-OH absorption band between 570 and 615 cm−1 in the latter.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1979

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Footnotes

2

On leave from Instituto de Edafologia, C.S.L.S. Mardrid, Spain.

1

Journal paper 7132, Purdue University Agricultural Experiment Station, West lafayette, indiana 47907.

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