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The structural relation between svetlozarite and dachiardite

Published online by Cambridge University Press:  05 July 2018

L. R. Gellens ,
G. D. Price  and
J. V. Smith
L. R. Gellens
Affiliation:
Department of the Geophysical Sciences, University of Chicago, Chicago, Illinois, USA 60637
G. D. Price
Affiliation:
Department of the Geophysical Sciences, University of Chicago, Chicago, Illinois, USA 60637
J. V. Smith
Affiliation:
Department of the Geophysical Sciences, University of Chicago, Chicago, Illinois, USA 60637
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Abstract

Svetlozarite, previously described as a new member of the mordenite group of zeolites, is reinterpreted as a multiply twinned and highly faulted dachiardite. X-ray diffraction study and transmission electron microscopy revealed (001) twins and (100) stacking faults. The former are attributed at least mainly to the insertion of a b glide plane between dachiardite sheets at each twin interface, which preserves the 5-ring linkages between the sheets. The latter are associated with loss of the C face-centring relation, and are attributed to replacement of shared 5-rings by linked 4-rings in the dachiardite sheets. Further study is needed to determine whether the structural faults in the dachiardite structures are chemically controlled.

Type
Research Article
Information
Mineralogical Magazine , Volume 45 , Issue 337 , 1982 , pp. 157 - 161
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1982

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Footnotes

*

Present address: Centrum voor Oppervlaktescheikunde en Colloidale Scheikunde, Katholieke Universiteit, Leuven, Belgium.

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