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Scanning Electron Microscopic Study of Imogolite Formation from Plagioclase

Published online by Cambridge University Press:  01 July 2024

Kazue Tazaki
Kazue Tazaki*
Affiliation:
Institute for Thermal Spring Research, Okayama University Misasa, Tottori-ken, 682-02, Japan
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Abstract

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Imogolite occurs as tiny bumps less than 0.05 µm in diameter and about 0.3 µm long on amorphous thin layers on the surface of weathered plagioclase. The bumps grow outward from the surface to form projections, which then develop into a fibrous imogolite. The fibers branch out and grow into widespread networks or thin films which finally cover the entire surface of the plagioclase grain. The fibers are about 0.05 µm in diameter as seen by transmission electron microscopy.

Резюме

Резюме

Имоголит появляется как очень маленькие выпуклости менее чем 0,05 μм в диаметре и около 0,3 μм в длину на аморфных тонких слоях на поверхности выветренного плагиоклаза. Выпуклости растут от наружной поверхности, образуя выступы, которые затем развиваются в волокнистый имоголит. Волокна разветвляются и разрастаются в широко расстилающиеся сети или тонкие пленки, которые в конце концов покрывают всю поверхность зерна плагиоклаза. Наблюдения с помощью трансмиссионного электронного микроскопа показали, что диаметр волокон обычно около 0,05 μм.

Resümee

Resümee

Imogolit kommt als kleine Blasen vor, welche weniger als 0,05 μm im Durchmesser und ungefähr 0,3 μm in Länge messen und sich auf dünnen, amorphen Schichten auf den Flächen von verwettertem Plagioklas befinden. Die Blasen wachsen nach außen von der Fläche heraus, um Projektionen zu formen, die sich dann zu faserigem Imogolit entwickeln. Die Fasern verzweigen sich und wachsen zu einem ausgedehnten Netz oder dünnen Filmen, welche endlich die gesamte Oberfläche des Plagioklaskems bedecken. Die Fasern sind ungefähr 0,05 μm im Durchmesser, was mit Rasterelektronenmikroskopie gesehen werden kann.

Résumé

Résumé

L'imogolite existe comme petites bosses de moins de 0,05 μm de diamètre et d’à peu près 0,3 μm de long sur de fines couches amorphes sur la surface de plagioclase altéré à l'air. Les bosses croissent de la surface vers l'extérieur pour former des projections qui se développent alors en imogolite fibreuse. Les fibres s’étendent et croissent en de larges réseaux ou en films fins qui couvrent finalement la surface entière du grain de plagioclase. Les fibres ont un diamètre d’à peu près 0,05 μm, vus par le microscope électronique par transmission.

Keywords

AlterationFiberImogolitePlagioclaseSEMWeathering
Type
Research Article
Information
Clays and Clay Minerals , Volume 27 , Issue 3 , June 1979 , pp. 209 - 212
Copyright
Copyright © 1979, The Clay Minerals Society

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