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Polytypism of Micas. III. X-Ray Diffraction Identification

Published online by Cambridge University Press:  02 April 2024

Z. Weiss  and
A. Wiewióra
Z. Weiss
Affiliation:
Coal Research Institute, 71607 Ostrava-Radvanice, Czechoslovakia
A. Wiewióra
Affiliation:
Institute of Geological Sciences, Polish Academy of Sciences, 02089 Warszawa, Poland
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Abstract

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Classification and identification criteria of maximum-degree-of-order (MDO) polytypes of homo- and meso-octahedral micas based on the distribution of the intensities of 20l (13l) and 02l reflections are proposed. Calculated | F(20l) |2 and | F(02l) |2 values for single crystals of micas with different compositions are given for one-, two-, and three-layer polytypes. Transmission powder diffractometry is proposed as a suitable method for the identification of the different groups of mica polytypes from polycrystalline specimens. Calculated powder patterns and the characteristic properties of the diffraction patterns of random and highly oriented aggregates are employed for identification purposes. The individual MDO polytypes are designated by generalized Ramsdell symbols which also contain information about their position in the classification system.

Resümee

Resümee

Klassifikations und Identifikationskriterien für alle maximaler Ordnungsgrad (MOG) Polytype von homo- und meso-oktaedrischen Glimmern, die auf den Intensitätenverteilungen von 20l (13l) und 02l Reflexen beruhen, wurden ausgearbeitet. Die berechneten |F(20l)|2 und |F(02l)|2 Werte für Glimmereinkristalle mit variabler Zusammensetzung und für alle Ein-, Zwei-, und Dreischicht-Polytypen sind angeführt. Als geeignete Methode zur Identifikation von verschiedenen Glimmergruppen in ihren polykristallinen Proben ist Transmissions-Diffraktometrie vorgeschlagen. Der Artikel enthält auch berechnete Pulverdiagramme und ihre Identifikations-charakteristische Eigenschaften für sowohl statistisch- als auch hochorientierte Aggregate. Die einzelnen MOG Polytype sind gekennzeichnet durch verallgemeinerte Ramsdellsche Symbole, die auch Information über ihre Stellung in dem Klassifikationssystem enthalten.

Keywords

Crystal structureMicaOrder-disorderPolytypeSingle crystal X-ray diffractionX-ray powder diffraction
Type
Research Article
Information
Clays and Clay Minerals , Volume 34 , Issue 1 , February 1986 , pp. 53 - 68
Copyright
Copyright © 1986, The Clay Minerals Society

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