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The Near-Infrared Combination Band Frequencies of Dioctahedral Smectites, Micas, and Illites

Published online by Cambridge University Press:  28 February 2024

James L. Post  and
Paul N. Noble
James L. Post
Affiliation:
Department of Civil Engineering and Chemistry Department, California State University, Sacramento, California 95819
Paul N. Noble
Affiliation:
Department of Civil Engineering and Chemistry Department, California State University, Sacramento, California 95819
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Abstract

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The highest frequency near-infrared (NIR) combination bands for specimens of four species of mica—montmorillonite-beidellite, illite, chlorite, and kaolinite—were correlated with respect to Al2O3 content. A direct linear correlation was found between the combination band positions and the Al2O3 contents of the montmorillonite-beidellite series, which may be given as: ν̄ cm−1 = (5.38 ± 0.04) (% Al2O3) + (4412.8 ± 0.9). A similar linear correlation for muscovite is: ν̄ cm−1 = (6.10 ± 0.25) (% Al2O3) + (4434.1 ± 8.3).

Possible NIR band interferences are shown for different mineral mixtures, along with the correlation of different illites with muscovite. No combination bands were found in the frequency region 4425 cm−1 to 4625 cm−1 for specimens in which the Al2O3 content was only in the tetrahedral layer sites.

Keywords

Al contentDioctahedral smectitesMicasNIR spectra
Type
Research Article
Information
Clays and Clay Minerals , Volume 41 , Issue 6 , December 1993 , pp. 639 - 644
Copyright
Copyright © 1993, The Clay Minerals Society

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