Oltu stone

Oltu stone, sometimes called also "Erzurum stone", is principally mined in the villages northeast of Oltu town, around Tutlu Dağı (Yasak Dağ) as well as in Alatarla, Hankaskışla and Çataksu villages.

[1][2] Oltu stone beds are formed when fossilized trees are subject to diastrophism resulting in folding.

[2] To distinguish true Oltu stone from the artificial jet, it is rubbed against unglazed porcelain.

Real Oltu stone will leave a chocolate brown streak.

Oltu stone is cut or carved in desired form and polished to manufacture various decorative ornaments and utensils like rings, earrings, necklaces, bracelets, tie pins, smoking pipes, cigarette holders, and prayer beads.