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A chemical, optical, and X-ray study of nepheline and Kaliophilite

With chemical analyses by M. H. HEY, B.A., B.Sc. (With Plates XXI and XXII.)

Published online by Cambridge University Press:  14 March 2018

F. A. Bannister  and
M. H. Hey
F. A. Bannister
Affiliation:
British Museum of Natural History
M. H. Hey
Affiliation:
British Museum of Natural History
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Summary

Correlated data prove the approximate constancy of the number of oxygen atoms in the unit cells of several nepheline and elaeolite specimens. Thence the number of atoms of each kind per unit cell have been counted. The cell-volumes and optical properties have slso been correlated with the chemical composition. An approximate structure is suggested which, together with the chemical work, explains the variable composition of nepheline. The contents of the unit cell may be written Si16−nAln(Na,K,½Ca)n where n ranges from 6.6 to 8.2. Kaliophilite is shown to possess a much larger cell than that of nepheline, and its Lauegram exhibits higher symmetry. 'Pseudonepheline' (rich in potassium) has a slightly greater cell-volume than normal nepheline, but its Lauegram is almost identical and its axial ratio only slightly less.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 22 , Issue 134 , September 1931 , pp. 569 - 608
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1931

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