Effects of heating on fire opal and diaspore from Turkey

HATİPOĞLU M., Can N., Karali T.

PHYSICA B-CONDENSED MATTER, cilt.405, sa.7, ss.1729-1736, 2010 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 405 Sayı: 7
  • Basım Tarihi: 2010
  • Doi Numarası: 10.1016/j.physb.2009.12.078
  • Dergi Adı: PHYSICA B-CONDENSED MATTER
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1729-1736
  • Anahtar Kelimeler: Gem quality fire opal and diaspore, Dehydratial behaviors, XRD, XRF, FTIR, DTA/TGA analyses, Turkey, CRYSTAL-STRUCTURE, SILICA MINERALS, GEM OPALS, CORUNDUM, MICROSTRUCTURE, CRISTOBALITE, NOMENCLATURE, LUMINESCENCE, DIFFRACTION, TRIDYMITE
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

Fire opal (SiO2 center dot nH(2)O) 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.