Başıbüyük, Z. (2018). Mineralogical, geochemical, and gemological characteristics of silicic gemstone in Aydıncık (Yozgat-Turkey). Arabian Journal of Geosciences, 11(12), 292. Link to Article
Organic Geochemistry and Depositional Environment of the Oltu Gemstone (Coal) in the Erzurum Area, NE Anatolia, Turkey
Kara-Gülbay, R., Korkmaz, S., Yaylalı-Abanuz, G., & Erdoğan, M. S. (2018). Organic Geochemistry and Depositional Environment of the Oltu Gemstone (Coal) in the Erzurum Area, NE Anatolia, Turkey. Energy & Fuels, 32(2), 1451-1463. Link to Article
Oltu-stone Prayer Beads
Çiftçi, H. G. (2018). Oltu-stone Prayer Beads. Design Roots: Local Products and Practices in a Globalized World, 93. Link to Article
Archaeo-gemmological investigation of gemstone glyptics (seal stones and ceremonial stones) and ancient jewelleries mounted gemstones in Izmir Archaeological Museum (Turkey)
Hatipoğlu, M., & Güney, H. (2013). Archaeo-gemmological investigation of gemstone glyptics (seal stones and ceremonial stones) and ancient jewelleries mounted gemstones in Izmir Archaeological Museum (Turkey). Journal of Cultural Heritage, 14(3), e165-e168. Link to Article
Origin and properties of Oltu gemstone coal
Karayigit, A. I. (2007). Origin and properties of Oltu gemstone coal. Energy Sources, Part A, 29(14), 1279-1284. Link to Article
Gemstone Deposits in Turkey
Hatipoglu, M., Babalik, H., & Chamberlain, S. (2010). Gemstone Deposits in Turkey. Rocks & Minerals, 85(2), 124-133. Link to Article