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Determination of the composition of natural nephelines by an X-ray method

Published online by Cambridge University Press:  14 March 2018

J. V. Smith  and
Th. G. Sahama
J. V. Smith
Affiliation:
Geophysical Laboratory, Carnegie Institution of Washington, Washington, D.C., U.S.A.
Th. G. Sahama
Affiliation:
Institute of Geology, Helsinki, Finland
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Extract

In the course of the investigation of the nepheline-kalsilite system by Tuttle and Smith an X-ray method for determining the KAlSiO4 content of synthetic nephelines of composition (Na,K)AlSiO4 has been developed. This method is rapid and sensitive to about 1 % in composition ; details will be given in a later publication.

Natural nephelines usually do not have the ideal composition (K,Na)AlSiO4, for they often contain excess silica and certain substituted atoms like Ca and Fe. We have, however, used this X-ray method on natural nephelines to see whether it is also applicable to them. If the method proved satisfactory, information on the chemical composition of natural nephelines could be rapidly obtained.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 30 , Issue 226 , September 1954 , pp. 439 - 449
Copyright
Copyright © 1954, The Mineralogical Society

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