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Effects of pretreatment on a 14 Å swelling mineral from Gartly, Aberdeenshire

Published online by Cambridge University Press:  09 July 2018

J. L. Perez-Rodriguez  and
M. J. Wilson
J. L. Perez-Rodriguez
Affiliation:
The Macaulay Institute for Soil Research, Aberdeen
M. J. Wilson
Affiliation:
The Macaulay Institute for Soil Research, Aberdeen
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Abstract

A 14 Å swelling mineral, interlayered with what is probably an organometallic complex, occurs in the surface horizon of a gleyed soil near Gartly, Aberdeenshire. The interlayer material is thermally stable at 300°C and is easily removed by oxidation with H2O2 and NaOCl. Treatment with HCl and Na2EDTA destroys the ability of the mineral to expand with glycerol, although not if the clay is H2O2 treated beforehand. The Gartly clay mineral is also unusual in that Mg-saturation, using magnesium acetate at pH 7, leads to the rapid formation of brucite-like interlayers. It is concluded that in the investigation of soil clays it is best to avoid all pretreatments.

Type
Research Article
Information
Clay Minerals , Volume 8 , Issue 1 , July 1969 , pp. 39 - 45
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1969

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