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A HRTEM Study of Cronstedtite: Determination of Polytypes and Layer Polarity in Trioctahedral 1:1 Phyllosilicates

Published online by Cambridge University Press:  28 February 2024

Toshihiro Kogure ,
Jiří Hybler  and
Slavomil Ďurovič
Toshihiro Kogure
Affiliation:
Department of Earth and Planetary Science, Graduate School of Science, the University of Tokyo, 7-3-1 Hongo, Bunkyoku, Tokyo 113-0033, Japan
Jiří Hybler
Affiliation:
Institute of Physics, Science Academy of the Czech Republic, Na Slovance 2, CZ-18221, Praha 8, Czech Republic
Slavomil Ďurovič
Affiliation:
Institute of Inorganic Chemistry, Slovak Academy of Sciences, SK-84236, Bratislava, Slovak Republic
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Abstract

It is shown that polytypes or stacking sequences of cronstedtite, an Fe-bearing trioctahedral 1:1 phyllosilicate, can be determined using near-atomic high-resolution transmission electron microscopy (HRTEM). By viewing along the [010], [310] and directions (orthohexagonal indexing), the four groups of the standard polytypes can be distinguished. Imaging along the [100], [110] and directions allows determination of the polytypes in each group. The polytypic sequences of groups A and C are intergrown at the monolayer level in cronstedtite from Lostwithiel, England, which is a new insight if compared with previous suggestions that layer stackings characteristic of different groups do not occur together. The HRTEM images also revealed the relationship between the layer polarity and the morphology of the cronstedtite crystals, where the tetrahedral sheet side points towards the top of the truncated pyramidal shape of the crystal.

Keywords

CronstedtiteHRTEMLayer PolarityMorphologyPolytypeStacking DisorderTrioctahedral 1:1 Phyllosilicates
Type
Research Article
Information
Clays and Clay Minerals , Volume 49 , Issue 4 , August 2001 , pp. 310 - 317
Copyright
Copyright © 2001, The Clay Minerals Society

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