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K-rich rectorite from kaolinized micaschist of the Sesia-Lanzo Zone, Italy

Published online by Cambridge University Press:  09 July 2018

E. Benincasa ,
M. F. Brigatti ,
L. Medici  and
L. Poppi
E. Benincasa
Affiliation:
Department of Earth Sciences, Modena and Reggio Emilia University, I-41100 Modena, Italy
M. F. Brigatti*
Affiliation:
Department of Earth Sciences, Modena and Reggio Emilia University, I-41100 Modena, Italy
L. Medici
Affiliation:
Department of Earth Sciences, Modena and Reggio Emilia University, I-41100 Modena, Italy
L. Poppi
Affiliation:
Department of Earth Sciences, Modena and Reggio Emilia University, I-41100 Modena, Italy
*
*E-mail: [email protected]
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Abstract

Rectorite crystals [[4](Si6.81Al1.19)[6](Al3.26Ti0.04Fe0.553+Mg0.18Mn0.01)[12](Na0.02K0.88 Mg0.16Ca0.01)O20(OH)4·0.75H2O] found in micaschist of the Sesia-Lanzo Zone (NW Italy) were studied using a variety of techniques including microprobe analysis, infrared spectroscopy, single crystal and powder X-ray diffraction, atomic force microscopy and thermal analysis. Chemical data and exchangeable cation determination indicate that K+ is the dominant non-exchangeable interlayer cation, and thus is believed to occupy the mica interlayer site; Mg2+ together with small amounts of Ca2+, Na+ and K+ represent the exchangeable cations and can therefore be related to the smectite-like component. The coefficient of variation, CV, of d(00l) values (CVnatural = 0.47; CVglycolated = 0.43) demonstrates the regularity of the mica-smectite interstratification, whereas the unit-cell parameters obtained by single crystal methods suggest different layer-stacking models.

Keywords

interstratified mica-smectiterectoritechemistryXRDthermal analysisIR spectroscopyatomic force microscopy
Type
Research Article
Information
Clay Minerals , Volume 36 , Issue 3 , September 2001 , pp. 421 - 433
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2001

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