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Polytypism of Micas. I. MDO Polytypes and Their Derivation

Published online by Cambridge University Press:  02 April 2024

K.-O. Backhaus  and
S. Ďurovič
K.-O. Backhaus
Affiliation:
Central Institute of Physical Chemistry, Academy of Sciences of the German Democratic Republic, 1199 Berlin-Adlershof, Rudower Chaussee 5, German Democratic Republic
S. Ďurovič*
Affiliation:
Institute of Inorganic Chemistry, Centre of Chemical Research Slovak Academy of Sciences, 842 36 Bratislava, Czechoslovakia
*
1To whom correspondence should be sent.
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Abstract

A procedure leading to the systematic derivation of all maximum-degree-of-order (MDO) polytypes in the three mica families, based on the order-disorder (OD) interpretation of mica structures, has been developed. There are 6 non-equivalent (8 non-congruent) homo-octahedral, 14 (22) mesooctahedral, and 36 (60) hetero-octahedral MDO mica polytypes. The ideal ditrigonalization of tetrahedral sheets leads to a splitting of the polytypes in any mica family into two subfamilies with octahedral and trigonal prismatic coordination of the interlayer cations, respectively.

Резюме

Резюме

Исходя их ОД-интерпретации кристаллических структур слюд, был установлен способ систематического вывода всех политипов с максимальной степенью упорядочения (МДО-политипов) для всех трех семейств слюд. Было получено 6 неэквивалентных (8 не конгруентных) гомо-окта- эдрических, 14 (22) мезо-октаэдрических и 36 (60) гетеро-октаэдрических МДО-политипов слюд. Идеальная дитригонализация тетраэдрических сеток приводит к распределению политипов любого семейства слюд на два суб-семейства с октаэдрической и тригонально-призматической координацией межслоевых катионов.

Resümee

Resümee

Es wurde eine Vorgangsweise entwickelt, die zur systematischen Ableitung aller maximaler Ordnungsgrad (MOG) Polytype in den drei Glimmerfamilien führte und auf der Interpretation von Ordnung-Unordnung der Glimmerstrukturen beruht. Es gibt 6 nicht-äquivalente (8 nicht-kongruente) homo-oktaedrische, 14 (22) meso-oktaedrische, und 36 (60) hetero-oktaedrische MOG-Glimmerpolytype. Die ideale Ditrigonalisierung der tetraedrischen Schichten führt zu einer Aufspaltung der Polytype in jeder Glimmerfamilie in zwei Subfamilien mit einer oktaedrischen und einer trigonal prismatischen Koordination der Zwischenschichtkationen. [U.W.]

Résumé

Résumé

On a developé un procédé menant à la dérivation systématique de tous les polytypes de degré d'ordre maximum (MDO) dans les trois familles de mica, basé sur l'interprétation ordre-désordre des structures des micas. Il y a 6 polytypes (MDO) de micas non-équivalents (8 non-congruents) homooctaédraux, 14 (22) méso-octaédraux, et 36 (60) hétéro-octaédraux. La ditrigonalisation idéale de feuilles tétraédrales mène à la scission des polytypes dans toute famille de mica en deux sousfamilles avec une coordination prismatique tétraédrale et trigonale des cations intercouche, respectivement. [D.J.]

Keywords

Maximum degree of orderMicaOrder-disorderPolytype
Type
Research Article
Information
Clays and Clay Minerals , Volume 32 , Issue 6 , December 1984 , pp. 453 - 463
Copyright
Copyright © 1984, The Clay Minerals Society

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