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Crystal chemistry of Na-rich rectorite from North Little Rock, Arkansas

Published online by Cambridge University Press:  02 January 2018

Jan Dietel ,
Annett Steudel ,
Laurence N. Warr  and
Katja Emmerich
Jan Dietel*
Affiliation:
Institute of Geography and Geology, Ernst-Moritz-Arndt University Greifswald, 17487, Greifswald, Germany
Annett Steudel
Affiliation:
Competence Center for Material Moisture (CMM) and Institute for Functional Interfaces (IFG), Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
Laurence N. Warr
Affiliation:
Institute of Geography and Geology, Ernst-Moritz-Arndt University Greifswald, 17487, Greifswald, Germany
Katja Emmerich
Affiliation:
Competence Center for Material Moisture (CMM) and Institute for Functional Interfaces (IFG), Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
*
*E-mail: [email protected]
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Abstract

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The rectorite, a regular mixed layer mineral consisting of dioctahedral swelling and non-swelling 2:1 layers, from North Little Rock, Arkansas, was studied to define the crystal chemistry and structural parameters (e.g. layer charge of the different layers, presence of cis/trans-vacancies). X-ray diffraction, simultaneous thermal analysis coupled with mass spectrometry, X-ray fluorescence and cation exchange capacity are used to characterize this rectorite. The rectorite has a coefficient of variation (CV) of 0.19 and a cation exchange capacity of 60 cmol(+)/kg, as determined by the ammonium acetate method. The mineral is best described as a regular interstratification of brammallite-like and highcharged beidellite-like layers. Dehydration occurs at ≈118°C with a mass loss of 6.77% and dehydroxylation occurs in two steps at 470°C and 588°C with an overall mass loss of 4.67%. Peak decomposition of the mass spectrometer curve of evolved water shows ≈20% peak area with a maximum higher than 600°C, indicating ≈20% cis-vacant layers.

Keywords

rectoriteregular interstratificationcrystal chemistrysimultaneous thermal analysiscis/transvacancy
Type
Research Article
Information
Clay Minerals , Volume 50 , Issue 3 , August 2015 , pp. 297 - 306
Creative Commons
Creative Common License - CCCreative Common License - BY
Copyright © The Mineralogical Society of Great Britain and Ireland 2015 This is an Open Access article, distributed under the terms of the Creative Commons Attribution license. (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2015

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