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A comparative electron-diffraction study of sillimanite and some natural and artificial mullites

Published online by Cambridge University Press:  14 March 2018

D. G. W. Smith  and
J. D. C. McConnell
D. G. W. Smith
Affiliation:
Department of Mineralogy and Petrology, Downing Place, Cambridge
J. D. C. McConnell
Affiliation:
Department of Mineralogy and Petrology, Downing Place, Cambridge
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Summary

Electron-diffraction photographs of some natural and synthetic mullites and a typical sillimanite have been obtained and are interpreted using diffraction data due to Agrell and Smith. The position and diffuseness of mullite reflections (h0l) with l = ½ have been re-studied. In such reciprocal lattice sections maxima are symmetrically disposed in pairs about the positions of sillimanite reflections with l odd. They lie on a* rows and show different separations in the specimens studied. These diffraction conditions are closely analogous to those observed in the intermediate plagioclases (paired ‘e’ maxima) and in nepheline, and a similar explanation is envisaged in terms of antiphase domain structure. Intimate association of a mullite-type phase and sillimanite is shown to result from the breakdown of muscovite in a thermal metamorphic aureole, and a chemical analysis of a natural Fe,Ti-bearing mullite from a spinel-mullite buchite in the same aureole, is presented.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 35 , Issue 274 , June 1966 , pp. 810 - 814
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1966

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References

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