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Water in sphere-type opal

Published online by Cambridge University Press:  05 July 2018

J. B. Jones  and
E. R. Segnit
J. B. Jones
Affiliation:
Department of Geology, University of Adelaide, Adelaide, Australia
E. R. Segnit
Affiliation:
Division of Building Research, C.S.I.R.O., Melbourne, Australia
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Summary

Surface areas of ‘amorphous’-type opals measured by nitrogen-absorption techniques were not consistent either with the surface area of the spheres of about 2000 Å diameter observable by electron microscopy or with the thermal dehydration data. This apparent inconsistency can be explained in terms of a smaller particulate structure of the order of 100–200 Å shown by higher resolution electron micrographs. This structure also accounts for a marked shrinkage shown in dilatometer curves of this type of opal.

Type
Research Article
Information
Mineralogical Magazine , Volume 37 , Issue 287 , September 1969 , pp. 357 - 361
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1969

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