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Application of gas chromatography to mineral chemistry: aluminium-silicon ordering in melilites

Published online by Cambridge University Press:  05 July 2018

E. E. Lachowski  and
F. P. Glasser
E. E. Lachowski
Affiliation:
Department of Chemistry, University of Aberdeen, Old Aberdeen, Meston Walk, Aberdeen AB9 2UE, Scotland
F. P. Glasser
Affiliation:
Department of Chemistry, University of Aberdeen, Old Aberdeen, Meston Walk, Aberdeen AB9 2UE, Scotland
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Summary

The mole fractions of the silicons present in melilites as monomeric (SiO4) and dimeric (Si2O7) groups depends both upon the composition of the melilite and also upon the degree of Al-Si ordering. It is shown that the absolute numbers of monomeric and dimeric silicons in a 10 mg polycrystalline sample can be determined by a relatively rapid chromatographic method.

A statistical theory is developed to treat the data; this contains a variable k-parameter that describes the degree of ordering.

Experimental results are presented and interpreted for one natural and five synthetic melilites. The synthetic gehlenite-rich melilites are appreciably, but not completely disordered. The natural melilite is well ordered, but heating at 1050 °C introduces considerable disorder.

Type
Research Article
Information
Mineralogical Magazine , Volume 39 , Issue 304 , December 1973 , pp. 412 - 419
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1973

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References

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