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The crystal structure of Mg end-member lizardite-1T forming polyhedral spheres from the Lizard, Cornwall

Published online by Cambridge University Press:  05 July 2018

M. Mellini ,
G. Cressey ,
F. J. Wicks  and
B. A. Cressey
M. Mellini
Affiliation:
Dipartimento di Scienze della Terra, Università di Siena, Via Laterina 8, 53100 Siena, Italy
G. Cressey*
Affiliation:
Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, UK
F. J. Wicks
Affiliation:
Natural History Department, Royal Ontario Museum, 100 Queen's Park, Toronto M5S 2C6, Canada
B. A. Cressey
Affiliation:
Electron Microscopy Centre, School of Chemistry, University of Southampton, Southampton SO17 1BJ, UK
*
*E-mail: [email protected]
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Abstract

The crystal structure of lizardite-1T from Gew-graze, Cornwall, has been refined by single-crystal X-ray diffraction to R1 of 0.0263 and 0.0557, for two crystals having P31m space group and lattice parameters a = 5.2905(5) Å, c = 7.2815(8) Å, and a = 5.3111(10) Å, c = 7.2907(15) Å, respectively. The Gew-graze lizardite is very close to the end-member composition, so these refinements confirm the existence of well crystallized pure Mg-lizardite and show this to be the most weakly H-bonded lizardite ever refined. With regard to its lattice parameters, Si–O bond distances and geometrical parameters controlled by interlayer interactions (i.e. H-bonding), the Gew-graze Mg end-member lizardite yields slight but observable geometrical differences compared with previous refined structures for specifically, aluminous, lizardites.

Keywords

serpentinepolyhedral sphereslizarditestructure
Type
Research Article
Information
Mineralogical Magazine , Volume 74 , Issue 2 , April 2010 , pp. 277 - 284
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2010

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References

Andréani, M., Grauby, O., Baronnet, A. and Muñoz, M. (2008) Occurrence, composition and growth of polyhedral serpentine. European Journal of Mineralogy, 20, 159–171.CrossRefGoogle Scholar
Baronnet, A. and Devouard, B. (2005) Microstructures of common polygonal serpentines from axial HRTEM imaging, electron diffraction, and lattice-simulation data. The Canadian Mineralogist, 43, 513–542.CrossRefGoogle Scholar
Baronnet, A., Andréani, M., Grauby, O., Devouard, B., Nitsche, S. and Chaudanson, D. (2007) Onion morphology and micro structure of polyhedral serpentine. American Mineralogist, 92, 687–690.CrossRefGoogle Scholar
Brown, I.D. and Altermatt, D. (1985) Bond-valence parameters obtained from a systematic analysis of the inorganic crystal structure database. Acta Crystallographica B, 41, 244–247.CrossRefGoogle Scholar
Capitani, G.C. and Mellini, M. (2006) The crystal structure of a second antigorite polysome (m=16), by single-crystal synchrotron diffraction. American Mineralogist, 91, 394–399.CrossRefGoogle Scholar
Cressey, B.A. and Zussman, J. (1976) Electron microscopic studies of serpentinites. The Canadian Mineralogist, 14, 307–313.Google Scholar
Cressey, G., Cressey, B.A. and Wicks, F.J. (2008) Polyhedral serpentine: a spherical analogue of polygonal serpentine? Mineralogical Magazine, 72, 1229–1242.CrossRefGoogle Scholar
Cressey, G., Cressey, B.A., Wicks, F.J. and Yada, K. (2010) A disc with five-fold symmetry: the proposed fundamental seed structure for the formation of chrysotile asbestos fibres, polygonal serpentine fibres and polyhedral lizardite spheres. Mineralogical Magazine, 74, 29–37.CrossRefGoogle Scholar
Dódony, I. (1997) Structure of the 30-sectored polygonal serpentine. A model based on TEM and SAED studies. Physics and Chemistry of Minerals, 24, 39–49.Google Scholar
Mellini, M. (1982) The crystal structure of lizardite-1T: hydrogen bonds and polytypism. American Mineralogist, 67, 587–598.Google Scholar
Mellini, M. and Viti, C. (1994) Crystal structure of lizardite-1T from Elba, Italy. American Mineralogist, 79, 1194–1198.Google Scholar
Mitchell, R.H. and Putnis, A. (1988) Polygonal serpentine in segregation-textured kimberlite. The Canadian Mineralogist, 26, 991–997.Google Scholar
Mugnaioli, E., Logar, M., Mellini, M. and Viti, C. (2007) Complexity in 15- and 30-sectors polygonal serpentine: Longitudinal sections, intrasector stacking faults and XRPD satellites. American Mineralogist, 92, 603–616.CrossRefGoogle Scholar
Sheldrick, G.M. (1997) SHELXL-97 Release 97-2 - A program for crystal structure refinement. University of Gottingen, Germany.Google Scholar
Wicks, F.J. and O'Hanley, D.S. (1988) Serpentine Minerals: structures and petrology. Pp. 91–167 in: Hydrous Phyllosilieates (exclusive of Micas) (Bailey, S.W., editor). Reviews in Mineralogy, 19, Mineralogical Society of America, Chantilly, Virginia, USA.CrossRefGoogle Scholar
Zega, T.J., Garvie, L.A.J., Dodony, I., Friedrich, H., Stroud, R.M. and Buseck, P.R. (2006) Polyhedral serpentine grains in CM chrondrites. Meteoritics and Planetary Science, 41, 681–690.CrossRefGoogle Scholar
Zhuklistov, A.P. and Zvyagin, B.B. (1998) Crystal structure of lizardite 1T from electron diffraetometry data. Crystallography Reports, 43, 1009–1014.Google Scholar
Supplementary material: File

Mellini et al. supplementary material

Structure factors 1

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Mellini et al. supplementary material

Strucure Factors 2

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