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Od-Interpretation of Kaolinite-Type Structures—I: Symmetry of Kaolinite Packets and Their Stacking Possibilities
Published online by Cambridge University Press: 01 July 2024
Abstract
The idealized symmetry of kaolinite-type minerals (1:1 phyllosilicates) is analysed in detail. They can be considered as OD-structures consisting of three kinds of OD-layers. Each of them, taken separately, possesses higher symmetry than their combination. This explains the well-known tendency of kaolinite-type minerals to form a wide variety of ordered and disordered polytypes as well as twins. The possible stacking sequences result from the different kinds of pairs of kaolinite layers which are derived for dioctahedral, trioctahedral as well as ‘monoctahedral’ kaolinite-type minerals, the latter being defined as those in which the three octahedral positions are occupied by three different cations or two different cations and a void. The analysis makes use of a simple symbolism and a simplified pictorial representation.
A brief summary of the most important terms and definitions of the theory of OD-structures is given in an Appendix.
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- Research Article
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- Copyright
- Copyright © 1975, The Clay Minerals Society
Footnotes
Kaolinite-type minerals will be called 'kaolinites' in the following, for short.
Some basic ideas of OD-theory and an explanation of the terms used in this paper are given in the Appendix. The letters OD may be interpreted as meaning that the theory deals with classes of polytypes containing ordered as well as disordered polytypes
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