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The Hinckley index for kaolinites

Published online by Cambridge University Press:  09 July 2018

A. Plançon ,
R. F. Giese  and
R. Snyder
A. Plançon
Affiliation:
CRSOCI and Université d'Orleans, 45100 Orleans, France
R. F. Giese
Affiliation:
Department of Geology, State University of New York, 4240 Ridge Lea Road, Amherst, NY 14226
R. Snyder
Affiliation:
New York College of Ceramics, Alfred University, Alfred, NY 14802, USA
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Abstract

The (02,11) X-ray diffraction band from a low-defect kaolinite from Cornwall (Hinckley index HI = 1·22) was examined to determine the defect structure. No combination of interlayer translations and admixing of dickite layers accurately modelled the observed diffraction pattern. Calculated diffraction patterns which gave a good agreement with the shape, position, and intensity of the observed peaks, uniformly had inter-peak intensities which were too weak. By treating the kaolinite as a mixture of low-defect (HI = 1·76) and moderate-defect (HI = 0·29) kaolinites, the agreement between the observed and calculated patterns was improved substantially. The existence of a mixture of two kaolinites was also found for a number of low-defect samples (HI > 0·4) from Georgia and Cornwall, and may be of even wider occurrence. The HI, which is very sensitive to the inner-peak intensities, does not estimate the types or abundances of various structural defects (the classical “crystallinity”), but is related directly, in a non-linear fashion, to the proportions of the two kinds of kaolinite which are present in the sample.

Type
Research Article
Information
Clay Minerals , Volume 23 , Issue 3 , September 1988 , pp. 249 - 260
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1988

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