The Secret Ridge Bed in Harney County, Oregon, lives up to its name with its remote location and relatively limited exposure in the rockhounding community. Thundereggs from this site are often medium-sized with dense, tan to reddish rhyolite matrix and interiors that reveal soft pastel agates—typically in shades of gray, lavender, pink, or blue. Some specimens include subtle moss or sagenite formations, while others feature open centers with quartz or chalcedony. Though not as widely known or commercially dug as other beds in the region, Secret Ridge material is valued for its delicate coloration and smooth cutting quality, making it a quiet favorite among collectors who discover it.
Rocks of the Cascades – Thundereggs, Tools & Tradition