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Imogolite: a unique aluminosilicate

Published online by Cambridge University Press:  09 July 2018

J. D. Russell ,
W. J. McHardy  and
A. R. Fraser
J. D. Russell
Affiliation:
The Macaulay lnstitute ybr Soil Research, Craigiebuckler, Aberdeen
W. J. McHardy
Affiliation:
The Macaulay lnstitute ybr Soil Research, Craigiebuckler, Aberdeen
A. R. Fraser
Affiliation:
The Macaulay lnstitute ybr Soil Research, Craigiebuckler, Aberdeen
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Abstract

The fibrous aluminosilicate imogolite has been studied by electronoptical and infrared absorption methods. Electron diffraction patterns are interpreted in terms of repeat units of 8·4 Å parallel and 23 Å perpendicular to the fibre axis. These spacings can not be reconciled with a continuous silicate chain structure and this conclusion is supported by an Si-O vibration near 930 cm−1. A structure is postulated in which distorted chains of Al-O octahedra are cross-linked through isolated Si2O7 groups.

Multiple OH stretching vibrations indicate different types of OH group in the imogolite structure. Absorption bands near 1000, 700 and 600 cm−1 are sensitive to sample orientation. This is attributed to the morphology and dimensions of the imogolite fibres.

Type
Research Article
Information
Clay Minerals , Volume 8 , Issue 1 , July 1969 , pp. 87 - 99
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1969

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