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On the existence of monoclinic NaAlSi3O8 s at elevated temperatures

Published online by Cambridge University Press:  14 March 2018

H. D. Grundy ,
W. L. Brown  and
W. S. MacKenzie
H. D. Grundy
Affiliation:
Department of Geology, The University, Manchester 13
W. L. Brown
Affiliation:
Department of Geology, The University, Manchester 13
W. S. MacKenzie
Affiliation:
Department of Geology, The University, Manchester 13
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Summary

Measurements from powder diffraction patterns recorded at temperatures up to 950° C for the supposed equilibrium forms of albite synthesized at 800°, 900°, and 1000° C by MacKenzie (1957) indicate that only the form synthesized at 1000° C becomes monoclinic. Single-crystal measurements on heated pure natural albite (Ab99·26) show that it becomes truly monoclinic, both in geometry and intensity distribution, at 930° C, the same temperature as for the highest-temperature synthetic form. These experiments were carried out in conditions that exclude possible contamination by potassium.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 36 , Issue 277 , March 1967 , pp. 83 - 88
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1967

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References

Brown, (W. L.), 1960. Zeits. Krist., vol. 113, pp. 297–329.Google Scholar
Brown, (W. L.), 1967. Min. Mag., vol. 36, pp. 80–82.Google Scholar
Mackenzie, (W. S.), 1952. Amer. Journ. Sci., Bowen vol., pp. 319–342.Google Scholar
Mackenzie, (W. S.), 1957. Ibid., vol. 255, pp. 481-516.CrossRefGoogle Scholar