Effects of heating on fire opal and diaspore from Turkey

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dc.contributor.authorHatipoǧlu M.
dc.contributor.authorCan N.
dc.contributor.authorKarali T.
dc.date.accessioned2024-07-22T08:20:59Z
dc.date.available2024-07-22T08:20:59Z
dc.date.issued2010
dc.description.abstractFire opal (SiO2·nH2O) and diaspore [Al(OH)O] are two different precious and rare mineral species with high water content. While these species are being cut and polished to make gems, defect-induced weaknesses such as fragility, splintering, and cracking become apparent since the temperature of the mineral species may be increased to high temperatures during the process. These deformations may be broadly related to water loss (molecular (H2O) and hydroxyl (OH) group) and transformation of the base building components and/or inclusion minerals. In this study, thermal properties and thermal stability as dehydratial behaviors of both gem quality fire opal (SiO2·nH2O) from the Şaphane region (Kütahya, Turkey) and gem quality diaspore (AlOHO) from the Milas region (Muǧla, Turkey), including some associated mineral inclusions, were studied by means of X-ray diffraction (XRD), X-ray fluorescence (XRF), Fourier transform-Infrared absorption (FTIR) spectroscopy and thermal analysis (DTA/TGA). During heating to 1400 °C, DTA/TGA patterns indicated that the weight losses of the fire opal and diaspore were due to the water loss only, and that these losses occur in the temperature ranges between about 342 and 722 °C in fire opal, and between about 592 and 718 °C in diaspore. In addition, after making some corrections concerning the mass gain observed, being due to the drift with buoyancy effect of the atmosphere, in their TGA curves, the fire opal shows a mass loss of 7.942%, and one distinctive sharp endotherm at 1089.99 °C and seven weaker endotherms, whereas the diaspore shows a mass loss of about 13.826%, and one distinctive sharpest endotherm at 650.47 °C and four weaker endotherms. © 2010 Elsevier B.V. All rights reserved.
dc.identifier.DOI-ID10.1016/j.physb.2009.12.078
dc.identifier.issn09214526
dc.identifier.urihttp://akademikarsiv.cbu.edu.tr:4000/handle/123456789/18400
dc.language.isoEnglish
dc.subjectAbsorption spectroscopy
dc.subjectBuoyancy
dc.subjectCements
dc.subjectFourier transform infrared spectroscopy
dc.subjectGems
dc.subjectHeating
dc.subjectInclusions
dc.subjectMinerals
dc.subjectRefractory materials
dc.subjectSilicate minerals
dc.subjectSilicon compounds
dc.subjectThermoanalysis
dc.subjectThermodynamic properties
dc.subjectWater content
dc.subjectX ray diffraction
dc.subjectX ray diffraction analysis
dc.subjectBuoyancy effect
dc.subjectDehydratial behaviors
dc.subjectDTA/TGA analyses
dc.subjectFTIR
dc.subjectHigh temperature
dc.subjectHigh water content
dc.subjectMass gain
dc.subjectMass loss
dc.subjectMineral inclusions
dc.subjectMineral species
dc.subjectTemperature range
dc.subjectTGA curves
dc.subjectThermal analysis
dc.subjectThermal properties
dc.subjectThermal stability
dc.subjectWater loss
dc.subjectWeight loss
dc.subjectX ray fluorescence
dc.subjectXRD
dc.subjectFires
dc.titleEffects of heating on fire opal and diaspore from Turkey
dc.typeArticle

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