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Crystallochemistry of Fe-rich palygorskite from eastern China

Published online by Cambridge University Press:  09 July 2018

Z. Li ,
K. He ,
L. Yin ,
F. Xiong  and
Y. C. Zheng
Z. Li
Affiliation:
Department of Earth Sciences, Nanjing University, Nanjing 210093, China
K. He
Affiliation:
Department of Earth Sciences, Nanjing University, Nanjing 210093, China
L. Yin*
Affiliation:
Department of Earth Sciences, Nanjing University, Nanjing 210093, China Research Center of Technical Engineering of Attapulgite, Nanjing 210093, China
F. Xiong
Affiliation:
Department of MaterialEn gineering, Luoyang College of Technology, Luoyang 471003, China
Y. C. Zheng
Affiliation:
Department of Earth Sciences, Nanjing University, Nanjing 210093, China
*
*E-mail: Zhenli.nju@gmail.com
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Abstract

Iron cations in the octahedral sheet are a disadvantage to the industrial application of palygorskite clays. In this study, a palygorskite sample from eastern China (Mayaoshan deposit, Jiangsu Province) is shown to have an Fe content that is much greater than usual. The structural formula of the Fe-rich palygorskite sample was established as (Si7.48Al0.52) (Al1.24Fe0.94Mg1.77Ti0.03⁏1.02)O20(OH)2(OH2)4. The palygorskite is seen to be dioctahedral according to the structural formula, consistent with Fourier transform infrared data. Occurrences of AlFe3+ɏOH and Fe3+Fe3+ɏOH vibrations in the OH-stretching and -bending regions show that Fe atoms occupy inner sites of octahedral sheets. A Mössbauer spectrum confirmed that Fe ions occupy inner octahedral sites as trivalent Fe cations (Fe3+).

Keywords

Fe-richMössbauerFTIRoctahedral occupancypalygorskite
Type
Research Article
Information
Clay Minerals , Volume 42 , Issue 4 , December 2007 , pp. 453 - 461
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2007

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