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

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