Thunder eggs are similar to geodes and are found in central and eastern Oregon. While the exterior of a thunder egg appears ordinary, the interior reveals agate, jasper, or opal.

People come to Oregon from all over the world to hunt for thundereggs, the seemingly unremarkable egg-shaped rocks that hide beautiful patterns of agate, opal, jasper and other gemstones. Oregon ...

HILLSBORO, Ore. (KPTV) - Thundereggs are a favorite among those who collect rocks and minerals. The popular rock even has its own day at the Rice Museum of Rocks and Minerals! FOX 12’s Ayo Elise ...