Crystallochemistry of Fe-rich palygorskite from eastern China
Authors: Li, Z.; He, K.; Yin, L.; Xiong, F.; Zheng, Y. C.
Source: Clay Minerals, Volume 42, Number 4, December 2007 , pp. 453-461(9)
Publisher: Mineralogical Society
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 (Si7.48 l0.52) (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+□OH and Fe3+Fe3+□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+).
Document Type: Research Article
Publication date: 2007-12-01