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Surface microtopography of interstratified mica and smectite from the Goto pyrophyllite deposit, Japan

Published online by Cambridge University Press:  09 July 2018

R. Kitagawa ,
A. Inoue  and
N. Kohyama
R. Kitagawa
Affiliation:
Department of Earth and Planetary Systems Science, Faculty of Science, Hiroshima University, Kagamiyuma, Higashihiroshima 724
A. Inoue
Affiliation:
Geological Institute, College of Arts and Sciences, Chiha University, Chiba 263
N. Kohyama
Affiliation:
National Institute of Industrial Health, Tama-ku, Kawasaki 214, Japan
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Abstract

By means of a gold decoration transmission electron microscopy (TEM) technique, interlaced spiral steps with a 10 A step height were observed on (001) surfaces of lath-shaped or elongated hexagonal rectorite crystals, i.e. interstratihed mica-smectite minerals, from the Goto pyrophyllite deposit in Nagasaki Prefecture, Japan. This is the first direct evidence to demonstrate that the growth of interstratified mica-smectite takes place by the spiral growth mechanism. The interlacing pattern is interpreted as appearing by co-operation of two hexagonal spiral layers of mica and smectite-like layers which have originated from a single dislocation and are stacked by rotation of 60°.

Type
Research Article
Information
Clay Minerals , Volume 29 , Issue 5 , December 1994 , pp. 709 - 715
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1994

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