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Infrared Absorption of O-H Bonds in Some Micas and Other Phyllosilicates

Published online by Cambridge University Press:  01 January 2024

Per Jørgensen
Per Jørgensen*
Affiliation:
Institute of Geology, Oslo, Blindern, Norway
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Abstract

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The frequencies, relative intensities and pleochroism of OH stretching bands in some micas and chlorites were studied, and the following conclusions are drawn

Trioctahedral 2:1 and 2:1:1 phyllosilicates, where all octahedral positions are filled with Mg, will have an absorption band about 3700 cm−1. These OH-groups have their axes normal to the mineral’s cleavage.

Substitution of Fe2+ for Mg results in a band about 3665 cm−1. Intensity ratios indicate that two Fe2+ most commonly substitute for two Mg in the same polyhedral group (pyramid).

Decreasing octahedral occupancy in the phlogopite-lepidomelane group, with increasing substitution of R3+ for Mg, causes bands with lower frequencies. These are not very sensitive to the incident angle for the infrared beam. In Li-micas where less than 50 per cent of the octahedral positions are filled with Li, and the rest of the positions are filled with Al and Fe2+, it seems probable that OH-groups residing in a pyramid with two Li and one Al cause a band about 3580 cm−1. Combinations of two Al and one Li or one Li, one Al and one Fe2+ cause absorption about 3480 cm−1.

Dioctahedral 2:1 phyllosilicates having Al or Fe3+ in octahedral positions cause absorption about 3620 cm−1.

Type
General Session
Information
Clays and Clay Minerals (National Conference on Clays and Clay Minerals) , Volume 13 , February 1964 , pp. 263 - 273
Copyright
Copyright © The Clay Minerals Society 1964

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