This Oregon thunderegg sphere measures 1.50″ diameter and was donated by Larry Bidwell. The shape of the sphere highlights the unique design of this Oregon state rock. Geologists believe that thundereggs formed in Oregon about 60 million years ago in lava flow gas pockets. Take home this unique sphere today!
100% of the proceeds from your purchase will be used to fund the Bidwell Gem & Mineral Museum. All shop items were donated by members of the Glendora Gems Lapidary Club.