... Queens Point is a small bed that requires a bit of hiking to reach. The thundereggs are usually small, with an aphanitic (fine-grained) matrix that somewhat resembles the Priday eggs. The agate in the eggs I have seen is clear to white with moss, tubes and quartz. I have also seen hollow specimens with a druzy quartz coating inside. This claim is open to the public...”

extract of the article from Mark Ketsdever, Hillsboro, Oregon, 2007 :”Thunderegg Agates of the Ochoco Mountains, Oregon, USA”