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The pressure dependence of the dehydration of gypsum to bassanite

Published online by Cambridge University Press:  05 July 2018

J. D. C. McConnell ,
D. M. Astill  and
P. L. Hall
J. D. C. McConnell
Affiliation:
Schlumberger Cambridge Research, P.O. Box 153, Cambridge, CB3 0HG, U.K.
D. M. Astill
Affiliation:
Schlumberger Cambridge Research, P.O. Box 153, Cambridge, CB3 0HG, U.K.
P. L. Hall
Affiliation:
Schlumberger Cambridge Research, P.O. Box 153, Cambridge, CB3 0HG, U.K.
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Abstract

A new experimental determination of the stability relationships for the dehydration of gypsum to the hemihydrate mineral bassanite at elevated temperature and pressure is described. The experimental method used depends on the observation of very small changes in pressure on the onset of reaction due to the potential volume change in the reaction. The technique yields P-T data of very high precision for this dehydration reaction, and the method is likely to be of use for other reactions. The experimental P-T results have been compared with those calculated from existing thermodynamic data for this reaction.

Keywords

gypsumbassanitedehydration
Type
Mineralogy
Information
Mineralogical Magazine , Volume 51 , Issue 361 , September 1987 , pp. 453 - 457
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1987

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