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Alteration of mica surfaces by water and solutions

Published online by Cambridge University Press:  09 July 2018

A. 't Serstevens
Affiliation:
Groupe de Physico-Chimie Minérale et de Catalyse, Université Catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium
P. G. Rouxhet
Affiliation:
Groupe de Physico-Chimie Minérale et de Catalyse, Université Catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium
A. J. Herbillon
Affiliation:
Groupe de Physico-Chimie Minérale et de Catalyse, Université Catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium Section de Physico-Chimie Minérale du Musée Royal de l'Afrique Centrale, Place Croix du Sud 1, B-1348 Louvain-la-Neuve, Belgium

Abstract

Samples of muscovite and phlogopite of particle sizes varying from less than 5 µm to 500 µm were allowed to stand in distilled water and in several NaNO3 solutions. The modifications of their surface were determined by thermovolumetric measurements of the extra-water associated with the altered rim.

Phlogopite undergoes congruent dissolution due to protonic action at low pH and vermiculitization by sodium under other conditions. Muscovite ground and aged in water suffers potassium hydrolysis and silica dissolution both of which contribute to the accumulation of aluminium on the surface. The altered rim, which develops on basal surfaces as well as on the edges, has an extra-water content of about 1·2 H2O molecules per accumulated Al atom; the surface can be cleaned by a treatment at low pH.

Résumé

Résumé

Des échantillons de muscovite et de phlogopite dont la taille variait de 500 µm à 5 µm ont été altérés au contact d'eau pure et de diverses solutions de nitrate de sodium. Les modifications apportées aux surfaces de ces échantillons ont été appréciées par la détermination volumétrique de l'eau d'hydratation liée à la mince pellicule altérée ainsi créée.

A bas pH, la phlogopite subit une dissolution congruente due à l'action des protons; dans les autres conditions, elle se vermiculitise sous l'action de l'ion Na+. Les muscovites broyées et vieillies en présence d'eau subissent une accumulation relative d'aluminium suite à l'action simultanée de l'hydrolyse du K+ et de la désilicification. Cette accumulation semble se produire tant sur les surfaces basales que sur les surfaces latérales des micas. La pellicule d'altération ainsi crééde possède un excès d'eau de 1·2 molécules pour chaque aluminium accumulé. Un traitement à pH 2 assure son décapage.

Kurzreferat

Kurzreferat

Muskovit- und Phlogopitproben im Korngrössenbereich von weniger als 5 µm bis 500 µm wurden mit destilliertem Wasser und verschiedenen NaCl-Lösungen behandelt. Es wurden die Veränderungen ihrer Oberflächen bestimmt und zwar durch thermovolumetrische Messungen des in der Verwitterungsschicht befindlichen zusätzlichen Wassers. Bei Phlogopit findet eine kongruente Auflösung statt, hervorgerufen durch die Wirkung von H+ bei niedrigem pH Wert und Vermikulisierung durch Natrium unter anderen Bedingungen. Unter Wasser zermahlener und verwitterter Muskovit unterliegt einer Kaliumhydrolyse und Kieselsäureauflösung, beide Vorgänge tragen zur Akkumulierung von Aluminium auf der Oberfläche bei. Die gealterte Schicht, welche sich auf den Basisflächen und an den Kanten bildet, hat einen zusätzlichen Wassergehalt von etwa 1·2 H2O Molekülen pro akkumuliertes Al-Atom. Durch Behandlung bei niedrigen pHWert kann dieses von der Oberfläche entfernt werden.

Resumen

Resumen

Se han dejado en reposo en agua destilada yen varias soluciones de NaNO3 muestras de muscovita y de flogopita de diversos tamaños de particulas que variaban desde menos de 5 µm hasta 500 µm. Las modificaciones de su superficie se han determinado por mediciones termovolumétricas del agua adicional relacionada con el borde alterado.

La flogopita sufre disolución congruente debido a la acción protónica con pH bajo y vermiculitización por el sodio en otras condiciones. La muscovita molida y envejecida en agua sufre hidrólisis del potasio y disolución de la sílice, contribuyendo ambas a la acumulación de aluminio en la superficie. El borde alterado, que se desarrolla en las superficies de la base además de en los bordes, tiene un contenido de agua adicional de unas 1·2 moléculas de H2O por cada átomo Al acumulado; la superficie puede limpiarse mediante un tratamiento con pH bajo.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1978

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