Micro-Raman spectroscopy of gem-quality chrysoprase from the Biga-Canakkale region of Turkey

HATİPOĞLU M., Oren U., KİBİCİ Y.

JOURNAL OF AFRICAN EARTH SCIENCES, cilt.61, sa.4, ss.273-285, 2011 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 61 Sayı: 4
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1016/j.jafrearsci.2011.08.002
  • Dergi Adı: JOURNAL OF AFRICAN EARTH SCIENCES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.273-285
  • Anahtar Kelimeler: Chrysoprase, Chalcedonic-quartz, Dispersive confocal micro-Raman spectroscopy (DC mu RS), Biga-Canakkale region, Turkey, CRYSTAL-STRUCTURE, SILICA, QUARTZ, VARIETIES, MINERALS, MOGANITE, SPECTRA, ORIGIN
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

The commercial quantities of gem-quality dark green chrysoprase are found as the fracture fillings covered with a weathering crust in the silicified serpentinites throughout the border of a metamorphic zone in the Biga-Canakkale region of Turkey. However, the green-stained opaque quartz materials are also present in the same deposit, but these materials are common and in low-demand according to chrysoprase in terms of gemmological importance. Thus, it is necessary to distinguish these two similar materials from each other non-destructively. In addition, all chrysoprase roughs in this deposit also have alpha-quartz and moganite inclusions. Accordingly, dispersive (visible) confocal micro-Raman spectroscopy (DC mu RS) allows us to distinguish clearly the chalcedonic-quartz silica phase (fibrous quartz (chalcedony)) from the crystalline-quartz silica phase (fine-grained alpha-quartz) in the case of both quartz inclusions in the chrysoprase material and itself of the green-stained quartz material in the same deposit.