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Reyerite

Published online by Cambridge University Press:  14 March 2018

R. A. Chalmers ,
V. C. Farmer ,
R. I. Harker ,
S. Kelly  and
H. F. W. Taylor
R. A. Chalmers
Affiliation:
Department of Chemistry, University of Aberdeen, Scotland
V. C. Farmer
Affiliation:
The Macaulay Institute for Soil Research, Aberdeen, Scotland
R. I. Harker
Affiliation:
The Johns-Manville Research Center, Manville, New Jersey, U.S.A.
S. Kelly
Affiliation:
Department of Chemistry, University of Aberdeen, Scotland
H. F. W. Taylor
Affiliation:
Department of Chemistry, University of Aberdeen, Scotland
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Summary

Reyerite from the original locality in Greenland has been re-examined using chemical analysis, infra-red absorption, X-ray powder and single-crystal diffraction, and thermal weight-loss curves. The unit cell is trigonal with a 9·74, c 19·04 Å, and the space group is probably P3¯. The unit cell contents are probably best represented as KCa14(Si24O60)(OH)5.5H2O, with some minor replacements. The molecular water is lost reversibly below 400° C. There are indications that the crystal structure is based on Si6O18 rings resembling those in beryl, but linked into sheets by additional tetrahedra.

Reyerite closely resembles truscottite, a mineral found originally in Sumatra, but there are distinct differences, especially in the infra-red pattern. It is not yet certain whether or not the two minerals should be considered as distinct species. Synthetic preparations examined resembled truscottite more closely than reyerite.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 33 , Issue 265 , June 1964 , pp. 821 - 840
Copyright
Copyright © 1964, The Mineralogical Society

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