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Some crystallographic studies in the system CaSO4–CaSOa4.2H2O II. The hydrous forms

Published online by Cambridge University Press:  14 March 2018

P. Gay
P. Gay*
Affiliation:
Department of Mineralogy and Petrology, University of Cambridge
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Summary

The existence and relationships of hydrated forms both to one another and to anhydrous CaSO4 have been studied by X-ray methods. Detailed study of the hemi-hydrate reveals its true cell to be monoclinic and does not confirm the previously suggested polymorphism.

Dehydration studies of the dihydrate and hemi-hydrate are reported; cyclic dehydration and hydration of single crystals of the latter show a variable temperature interval between the formation of γ-CaSO4 and the reconstitution of the hemihydrate at approximately constant humidity. An explanation of this behaviour is offered, and the structural implications of the results of the dehydration studies are discussed.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 35 , Issue 270 , June 1965 , pp. 354 - 362
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1965

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References

References (for Parts I and II)

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