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Structural Factors Controlling Stacking Sequences in Dioctahedral Micas

Published online by Cambridge University Press:  01 July 2024

Necip Güven
Necip Güven*
Affiliation:
Department of Geology, University of Illinois, Urbana, Ill. 61801, U.S.A.
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Abstract

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Deviations in the symmetry of mica single layers from the ideal arrangement with all atoms in hexagonal arrays are caused by the structural factors such as compositional variation (substitutions), order-disorder, and distortions. The derivative crystal structure theory as applied to mica polymorphism, implies that the ideal symmetry of the mica single layer (C2/m) can be altered to one of its standard subgroups by these structural factors. The “derivative structure” of the single layer may allow a unique interlayer and a specific intralayer configuration and result in a regular stacking sequence.

Résumé

Résumé

Les écarts observés entre la symétrie de feuillets isolés de mica et l’arrangement idéal dans lequel tous les atomes sont rangés selon des hexagones sont dus à des facteurs structuraux tels que la variabilité de la composition (substitution), les effets d’ordre-désordre, et les distorsions. La théorie de la “structure dérivée” du cristal, appliquée au polymorphisme des micas, implique que la symétrie idéale du feuillet isolé de mica (C 2/m) peut être altérée en l’un de ses sous groupes normaux par ces facteurs structuraux. La “structure dérivée” du feuillet isolé peut autoriser une configuration interfeuillet unique et une configuration intrafeuillet spécifique, et entraîner de ce fait une séquence de superposition régulière.

Kurzreferat

Kurzreferat

Abweichungen in der Symmetrie von Glimmereinzelschichten von der idealen Anordnung mit allen Atomen in hexagonalen Verteilungen werden durch strukturelle Faktoren, wie etwa Veränderungen in der Zusammensetzung (Substituierung), Ordnung-Unordnung und Verzerrungen verursacht. Die Theorie der abgeleiteten Kristallstruktur, angewendet auf Glimmerpolymorphie, besagt, dass die ideale Symmetrie der Glimmereinzelschicht (C2/m) durch diese strukturellen Faktoren zu einer ihrer normalen Untergruppen verändert werden kann. Die “abgeleitete Struktur” der Einzelschicht kann eine eindeutige Zwischenschichtoder eine spezifische Intraschichtkonfiguration ermöglichen und eine regelmässige Stapelfolge ergeben.

Резюме

Резюме

Отклонения симметрии слюдяного слоя от идеального строения с гексагональным мотивом расположения всех атомов, обусловлены рядом структурных факторов, таких как изменения в составе (замещения), порядок-беспорядок, искажения. Теория производнях кристаллических структур в применении к полиморфизму слюд показывает, что идеальная симметрия слюдяного слоя (С2/m) может изменяться под действием перечисленных струк-турных факторов до одной из присущих ей стандартных подгрупп. «Производная структура» слюдяного слоя может обуславливать специфическую конфигурацию межслоевого про-странства и, как следствие, приводить к упорядоченной последовательности слоев.

Type
Research Article
Information
Clays and Clay Minerals , Volume 19 , Issue 3 , July 1971 , pp. 159 - 165
Copyright
Copyright © Pergamon Press 1971

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