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Mica Weathering Rates as Related to Mica Type and Composition

Published online by Cambridge University Press:  01 July 2024

R. A. Leonard  and
S. B. Weed
R. A. Leonard*
Affiliation:
Department of Soil Science, North Carolina Agricultural Experiment Station, North Carolina State University, Raleigh, N.C. 27607
S. B. Weed*
Affiliation:
Department of Soil Science, North Carolina Agricultural Experiment Station, North Carolina State University, Raleigh, N.C. 27607
*
†Research Soil Scientist, USDA, Watkinsville, Georgia 30677 (formerly Instructor, Department of Soil Science, North Carolina State University, Raleigh, North Carolina.
‡Professor of Soils, North Carolina State University, Raleigh, North Carolina.
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Abstract

Potassium release rates from micas varying widely in type and composition were measured. A sodium tetraphenylboron solution was used as the extracting agent. Muscovites were found to be two orders of magnitude more stable than a naturally occurring phlogopite and biotite. Synthetic fluorphlogopite was as stable as some muscovites. Lepidolite was the most stable mica. Primary factors affecting mica stability are thought to be: Hydroxyl bond orientation, isomorphous replacement of OH− by F−, the stronger Lewis base, and structural factors that lead to compression or stretching of the K—O bond.

Résumé

Résumé

Les taux d’extraction du potassium de micas de types et de composition très différents ont été mesurés. Une solution de tétraphényl-bore de sodium a été utiliséc comme agent extracteur. On a trouvé que les muscovites étaient de deux ordres de grandeur plus stables que la phlogopite et la biotite naturelles. La fluorophlogopite synthétique était aussi stable que quelques muscovites. La lépidolite est le mica le plus stable. On pense que les facteurs primaires affectant la stabilité du mica sont: l’orientation de la liaison hydroxyle, le remplacement isomorphe de OH− par F_, une base Lewis plus forte et les facteurs structurels qui occasionnent la compression ou l’allongement de la liaison K—O.

Kurzreferat

Kurzreferat

Die Geschwindigkeiten der Abgabe von Kalium aus Glimmern, die sich in Bezug auf Typ und Zusammensetzung stark yon einander unterschieden, wurden gemessen. Als Extraktionsmittel wurde eine Natriumtetraphenylborlösung verwendet. Es wurde festgestellt, dass Muskowite um zwei Grössenordnungen beständiger sind als ein natürlich vorkommender Phlogopit und Biotit. Synthetischer Fluorphlogopit war ebenso beständig wie gewisse Muskowite. Lepidolit stellte den beständigsten Glimmer dar. Man glaubt, dass die Beständigkeit der Glimmer in erster Linie durch folgende Faktoren beeinflusst wird: Orientierung der Hydroxylbindung, isomorpher Ersatz von OH− durch F2, die stärkere Lewis Base, sowie strukturelle Faktoren, die Anlass zu einer Stauchung oder Dehnung der K—O Bindung geben.

Резюме

Резюме

Измерены скорости удаления калия из слюд, существенно различающихся по типу и составу. В качестве экстрагирующего агента применялся раствор натриевого тетрафенилбора. Установлено, что мусковиты на два порядка устойчивей природных флогопитов и биотитов. Синтетический фторфлогопит также устойчив как и некоторые мусковиты. Лепидолит оказался наиболее устойчивой слюдой. Выделены следующие первичные факторы, влияющие на устойчивость слюд: ориентация водородных связей, изоморфные замещения ОН− на F−, более сильное основание Люиса, и структурные факторы, приводящие к сжатию или растяжению связи К-0.

Type
Research Article
Information
Clays and Clay Minerals , Volume 18 , Issue 4 , November 1970 , pp. 187 - 195
Copyright
Copyright © 1970 The Clay Minerals Society

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Footnotes

*

Published with the approval of the Director as Paper No. 2929 of the Journal Series.

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