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A disc with fivefold symmetry: the proposed fundamental seed structure for the formation of chrysotile asbestos fibres, polygonal serpentine fibres and polyhedral lizardite spheres

Published online by Cambridge University Press:  05 July 2018

G. Cressey ,
B. A. Cressey ,
F. J. Wicks  and
K. Yada
G. Cressey*
Affiliation:
Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, UK
B. A. Cressey
Affiliation:
Electron Microscopy Centre, School of Chemistry, University of Southampton, Southampton SO17 1BJ, UK
F. J. Wicks
Affiliation:
Natural History Department, Royal Ontario Museum, 100 Queen's Park, Toronto M5S 2C6, Canada
K. Yada
Affiliation:
Technical Center 2, 2-27-7 Tamagawa Chofu, Tokyo 182-0025, Japan
*
*E-mail: g.cressey@nhm.ac.uk
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Abstract

A chrysotile disc is proposed as the fundamental seed structure for the formation of chrysotile asbestos fibres, polygonal serpentine fibres and polyhedral lizardite spheres. The curvature, fivefold symmetry and hydrogen-bonding alignment of the layers in the seed disc control the formation of the 15 or 30 sectors in polygonal serpentine and the orientations of the planar arrays of 15 or 30 radial crystals in polyhedral serpentine. A polygonized disc precursor to polygonal fibre formation has been observed at an arrested stage of growth in a synthesis experiment.

Keywords

fivefold symmetryserpentinelizarditechrysotileasbestospolygonal fibrespolyhedral spheres
Type
Letter
Information
Mineralogical Magazine , Volume 74 , Issue 1 , February 2010 , pp. 29 - 37
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2010

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