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Polymorph and Polytype Identification from Individual Mica Particles Using Selected Area Electron Diffraction

Published online by Cambridge University Press:  01 January 2024

Anne-Claire Gaillot ,
Victor A. Drits  and
Bruno Lanson
Anne-Claire Gaillot*
Affiliation:
Université de Nantes, CNRS, Institut des Matériaux Jean Rouxel, IMN, F-44000 Nantes, France
Victor A. Drits
Affiliation:
Geological Institute, Russian Academy of Sciences, 7 Pyzhevsky street, 119017 Moscow, Russia
Bruno Lanson
Affiliation:
Université Grenoble Alpes, CNRS, Université Savoie Mont Blanc, IRD, Université Gustave Eiffel, ISTerre, F-38000 Grenoble, France
*
*E-mail address of corresponding author: Anne-Claire.Gaillot@cnrs-imn.fr
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Abstract

Dioctahedral micas are composed of two tetrahedral sheets and one octahedral sheet to form TOT or 2:1 layers. These minerals are widespread and occur with structures differing by (1) the layer stacking mode (polytypes), (2) the location of vacancies among non-equivalent octahedral sites (polymorphs), and (3) the charge-compensating interlayer cation and isomorphic substitutions. The purpose of the present study was to assess the potential of parallel-illumination electron diffraction (ED) to determine the polytype/polymorph of individual crystals of finely divided dioctahedral micas and to image their morphology. ED patterns were calculated along several zone axes close to the c*- and c-axes using the kinematical approximation for trans- and cis-vacant varieties of the four common mica polytypes (1M, 2M1, 2M2, and 3T). When properly oriented, all ED patterns have similar geometry, but differ by their intensity distribution over hk reflections of the zero-order Laue zone. Differences are enhanced for ED patterns calculated along the [001] zone axis. Identification criteria were proposed for polytype/polymorph identification, based on the qualitative distribution of bright and weak reflections. A database of ED patterns calculated along other zone axes was provided in case the optimum [001] orientation could not be found. Various polytype/polymorphs may exhibit similar ED patterns depending on the zone axis considered.

Keywords

Cis-vacantDioctahedral micaElectron diffractionIlliteMuscovitePolymorphPolytypeTrans-vacantZone-axis orientation
Type
Article
Information
Clays and Clay Minerals , Volume 68 , Issue 4 , August 2020 , pp. 334 - 346
Copyright
Copyright © Clay Minerals Society 2020

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