Water in sphere-type opal
- 1 September 1969
- journal article
- Published by Mineralogical Society in Mineralogical Magazine
- Vol. 37 (287), 357-361
- https://doi.org/10.1180/minmag.1969.037.287.07
Abstract
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.Keywords
This publication has 6 references indexed in Scilit:
- Origin of Precious OpalNature, 1966
- The role of water in opalJournal of the Geological Society of Australia, 1965
- Colour of Precious OpalNature, 1964
- Structure of OpalNature, 1964
- Surface hydration of silicasTransactions of the Faraday Society, 1961
- Influence of Capillarity on the Boiling Point of WaterThe Journal of Physical Chemistry, 1955