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Further discussion of framework structures built from four- and eight-membered rings

Published online by Cambridge University Press:  14 March 2018

J. V. Smith
J. V. Smith*
Affiliation:
Department of the Geophysical Sciences, University of Chicago, Chicago, Illinois 60637, U.S.A.
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Summary

The classification of framework structures built from chains of four-membered rings of type UUDD is incomplete: there are two basic ways in which the chains can be cross-linked to form eight-membered rings. The first type of frame-work (already described) is extremely flexible, permitting the cavities to be either large or small; the second type is inflexible and the cavities are small. Feldspar belongs to the second type and had been incorrectly ascribed to the first type: paracelsian, harmotome, and gismondine had been correctly placed in the first group.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 36 , Issue 281 , March 1968 , pp. 640 - 642
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1968

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References

Smith, (J. V.) and Rinaldi, (F.), 1962. Min. Mag., vol. 33, p. 202.Google Scholar