Oregon is a rockhound’s paradise not just for thundereggs, but for an incredible variety of other mineral treasures. The state is rich in agate, jasper, obsidian, and petrified wood, with notable locations like the Owyhee River for picture jasper, Glass Buttes for rainbow obsidian, and Holley for brightly colored moss agates. Fossil beds in the John Day Formation yield ancient leaf and wood specimens, while sunstones—Oregon’s official state gemstone—can be collected from public mining areas near Plush. With its diverse volcanic history and active geological past, Oregon offers far more than thundereggs to those willing to explore.
Rocks of the Cascades – Thundereggs, Tools & Tradition