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Chemistry, morphology and structural characteristics of synthetic Al-lizardite

Published online by Cambridge University Press:  09 July 2018

M. Bentabol*
Affiliation:
Departamento de Química Inorgánica, Cristalografía y Mineralogía. Facultad de Ciencias. Universidad de Málaga, Spain
M. D. Ruiz Cruz
Affiliation:
Departamento de Química Inorgánica, Cristalografía y Mineralogía. Facultad de Ciencias. Universidad de Málaga, Spain
I. Sobrados
Affiliation:
Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas (CSIC), Cantoblanco, 28049 Madrid, Spain
*

Abstract

Al-lizardite has been synthesized under hydrothermal conditions (200ºC). Morphologically, Al-lizardite consists of thin platy particles ~400 Å wide and ~150 Å thick. Structurally, the X-ray diffraction patterns indicate that the 2H2 polytype is dominant, with cell parameters: a = 5.311(0.006) Å; c = 14.333 (0.013) Å and space group P63. High-resolution transmission electron microscopy images revealed, however, the presence of other polytypes and abundant stacking disorder. Chemically, Al-lizardite consists of a single population with average tetrahedral composition Si1.74Al0.26. In contrast to previously described Al-rich serpentines (amesite and Al-lizardite), this Al-lizardite is characterized by an asymmetrical Al distribution, with VIAl ≈0.70 and IVAl ≈0.25 atoms per formula unit.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2010

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