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Clay Minerals; December 2007; v. 42; no. 4; p. 453-461; DOI: 10.1180/claymin.2007.042.4.03
© 2007 Mineralogical Society of Great Britain and Ireland
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Research Paper

Crystallochemistry of Fe-rich palygorskite from eastern China

Z. LI1, K. HE1, L. YIN1,2,*, F. XIONG3 and Y. C. ZHENG1

1 Department of Earth Sciences, Nanjing University, Nanjing 210093, China, 2 Research Center of Technical Engineering of Attapulgite, Nanjing 210093, China, and 3 Department of Material Engineering, Luoyang College of Technology, Luoyang 471003, China

* E-mail: Zhenli.nju{at}gmail.com

(Received 17 February 2007; revised 18 July 2007)

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 (Si 7.48Al 0.52 ) (Al1.24Fe0.94Mg1.77Ti0.03{square}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+{square}OH and Fe3+Fe3+{square}OH 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-rich, Mössbauer, FTIR, octahedral occupancy, palygorskite






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