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Structural anomalies in tobelite-2M2 explained by high resolution and analytical electron microscopy

Published online by Cambridge University Press:  02 January 2018

G. C. Capitani
Affiliation:
Dipartimento di Scienze dell’Ambiente e del Territorio e di Scienze della Terra, Università di Milano Bicocca, P.za della Scienza 4, I-20126 Milano, Italy
E. Schingaro*
Affiliation:
Dipartimento di Scienze della Terra e Geoambientali, Università degli Studi di Bari ALDO MORO, via E. Orabona 4, I-70125 Bari, Italy
M. Lacalamita
Affiliation:
Dipartimento di Scienze della Terra e Geoambientali, Università degli Studi di Bari ALDO MORO, via E. Orabona 4, I-70125 Bari, Italy
E. Mesto
Affiliation:
Dipartimento di Scienze della Terra e Geoambientali, Università degli Studi di Bari ALDO MORO, via E. Orabona 4, I-70125 Bari, Italy
F. Scordari
Affiliation:
Dipartimento di Scienze della Terra e Geoambientali, Università degli Studi di Bari ALDO MORO, via E. Orabona 4, I-70125 Bari, Italy

Abstract

A transmission electron microscopy (TEM) investigation was undertaken in order to elucidate the nature of the structural disorder in a tobelite specimen from the sedimentary rocks of the Armorican sandstones (western France). This structural disorder may be the origin of residual electron-density maxima in difference-Fourier maps reported previously in single-crystal XRD studies of tobelite. The TEM investigation of tobelite confirmed that it is the 2M2 polytype in subfamily-B, but the ordered sequence is interrupted by numerous stacking faults parallel to (001), for which the stacking vectors belong to both subfamilies-A and -B of mica polytypes, with a prevalence of the latter. Chemical heterogeneity depending on the Si/Al ratio and Na and Mg concentration was observed at the nanoscale among different mica lamellae in a single crystal. The observed variations are consistent with a change in mica chemistry leading to interlayer vacancies which may cause shortening of the interlayer separation, as revealed by the single-crystal structure refinements.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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