Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 99: Issue 3
Thermal properties of Australian sedimentary opals and Czech moldavites
Authors:
P. Thomas Department of Chemistry and Forensic Sciences, University of Technology Sydney, PO Box 123, Sydney, NSW 2007, Australia

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J. Šesták Solid-State Physics Section, Institute of Physics, Academy of Sciences, v.v.i., Cukrovarnická 10, 162 53 Praha 6, Czech Republic

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K. Heide Chemisch-Geowissenschaftliche Fakultat, Universitat Jena, Burgweg 11, 07749 Jena, Germany

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E. Fueglein Netzsch-Gerätebau GmbH, Wittelsbacherstraße 42, 95100 Selb, Germany

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P. Šimon Department of Physical Chemistry, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, 812 37 Bratislava, Slovak Republic

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Pages:
861–867
Online Publication Date:
17 Feb 2010
Publication Date:
01 Mar 2010
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-010-0706-z
Keywords:
Amorphous Silica; DEGAS; Moldavite; Opal; TG–DSC; TMA
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Abstract  

The thermal properties are presented for a precious opal sourced from Coober Pedy, South Australia and a moldavite from Bohemia, Czech Republic whose origins differ significantly as opal is derived from the slow isothermal diagenesis of silica, while the tektites are specimens of vitreous silica formed from the terrestrial impact of asteroids. The differences between the two glassy silicates are presented through measurement of the TG–DSC, TMA and high-vacuum-hot-extraction DEGAS analysis.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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