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Surface microtopography of sudoite

Published online by Cambridge University Press:  09 July 2018

M. Jige*
Affiliation:
Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University, KagamiyamaHisgashihiroshima739-8526, Japan
R. Kitagawa
Affiliation:
Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University, KagamiyamaHisgashihiroshima739-8526, Japan
V. V. Zaykov
Affiliation:
Instituteof Mineralogy, Urals Branch Academy of Sciences, MiassChelyabinsk District 456301, Russian Federation
I . Sinyakovskaya
Affiliation:
Instituteof Mineralogy, Urals Branch Academy of Sciences, MiassChelyabinsk District 456301, Russian Federation
*
*E-mail: jige@letitbe.geol.sci.hiroshima-u.ac.jp

Abstract

The gold-decoration technique of electron microscopy is used to study the surface microtopography of natural (001) surfaces of sudoite collected from a hydrothermal vein of the Berezovsk gold deposit, Central Urals, Russia. Only closed step patterns with malformed and/or nearly circular islands were observed on the (001) growth surface of sudoite crystals, implying a twodimensional nucleation mechanism. This is in contrast to the spiral step patterns commonly recognized on growth surfaces of other clay minerals, such as illite and kaolinite, formed under hydrothermal conditions. It is inferred that the crystallization of sudoite occurred under relatively higher temperatures and/or from more highly supersaturated fluids than many other hydrothermal clay minerals so far described.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2003

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