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The fibrous zeolite erionite; its occurrence, unit cell, and structure

Published online by Cambridge University Press:  14 March 2018

Lloyd W. Staples  and
J. A. Gard
Lloyd W. Staples
Affiliation:
University of Oregon, Eugene, Oregon, U.S.A.
J. A. Gard
Affiliation:
Dept. of Chemistry, University of Aberdeen, Scotland
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Summary

The type locality for erionite has been identified and specimens compared with Eakle's original material. New determinations of the physical properties and a chemical analysis have been made. Correlation of X-ray powder and fibre rotation data with electron diffraction of single crystals has shown that the unit cell is hexagonal with a 13·26, c 15·12 Å., space-group P31c, P¯31c, P63mc, P¯62c, or P63/mmc, giving a calculated sp. Gr. of 2·07 and atomic cell contents (Ca, Mg, Na2, K2)4·5Al9Si27O72.27H2O. A structure is proposed for the aluminosilicate frame, with space-group P63/mmc, which gives satisfactory correlation between observed and calculated structure factors for the X-ray fibre rotation pattern.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 32 , Issue 247 , December 1959 , pp. 261 - 281
Copyright
Copyright © 1959, The Mineralogical Society

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