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The thermal expansion of the sodalite group of minerals

Published online by Cambridge University Press:  14 March 2018

D. Taylor
D. Taylor*
Affiliation:
Department of Geology, University of Manchester
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Summary

Thermal expansion data up to 920° C by powder X-ray diffraction methods are presented for four noseans, five haüynes, and one sodalite. The rate of thermal expansion is at first high and increases with temperature; this is interpreted as due to the untwisting of the partially collapsed framework. Above a certain temperature (which depends on the mineral and its composition) the rate of thermal expansion is much lower and is linear with temperature; this corresponds to the rate of thermal expansion of the more fully expanded framework. Sodalite does not show this second stage below 920° C. The thermal expansion behaviour of other framework silicates is interpreted in analogy to that of the sodalite group.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 36 , Issue 282 , June 1968 , pp. 761 - 769
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1968

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