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Determination of the composition of kalsilites by an X-ray method

Published online by Cambridge University Press:  14 March 2018

Th. G. Sahama ,
K. J. Neuvonen  and
Kai Hytönen
Th. G. Sahama
Affiliation:
Institute of Geology, Helsinki, Finland
K. J. Neuvonen
Affiliation:
Geological Survey, Helsinki, Finland
Kai Hytönen
Affiliation:
Institute of Geology, Helsinki, Finland
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Summary

Three new analyses of kalsilite are given, with optical and X-ray data; two (K/(K + Na) = 0·95. 0·98) are from rocks where it is closely associated with nepheline. An analysis of one of the nephelines is also given (K/(K + Na) = 0·31). The cell dimensions vary appreciably with sodium content, and the composition of kalsilite may be determined from the equation:

100 K/(K + Na) = 100−227·27(Δ 6·264),

where Δ is the difference, in degrees, between the diffraction angles 2ϑ for 102 and 101, using Cu-Kα radiation.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 31 , Issue 234 , September 1956 , pp. 200 - 208
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1956

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References

Bannister, (F. A.) and Hey, (M. H.), 1942. Min. Mag., Vol. 26, p. 218.Google Scholar
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Rigby, (G. R.) and Richardson, (H. M.), 1947. Ibid., Vol. 28, p. 75.Google Scholar
Sahama, (Th. G.), 1953. Ann. Acad. Scient. Fenn., Ser. A III, No. 36, p. 1 [M.A. 12-372].Google Scholar
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Smith, (J. V.) and Sahama, (Th. G.), 1954. Min. Mag., Vol. 30, p. 439.Google Scholar
Smith, (J. V.) and Sahama, (Th. G.), 1956. The nepheline-kalsilite system: I. X-ray data for the crystalline phases (in press).Google Scholar