EN
Obsidian near the Zemplín Hills comes from primary (Viničky) and secondary (Brehov and Cejkov) sources. In Viničky, primary sources of obsidian come from two phases of rhyolite volcanism. The older phase is represented by perlite breccias with obsidian found underneath rhyolite extrusive body, younger phase consists of obsidian and perlite bonded with intrusive dyke bodies.