The Mutton Mountain Bed, located in Wasco County, Oregon, is a thunderegg site known for producing nodules with bold, richly colored agate interiors. Thundereggs from this bed often feature deep reds, oranges, and purples, frequently with moss or sagenite inclusions that give the interiors a dramatic, textured appearance. The rhyolite matrix is typically dense and reddish-brown, with well-formed, solid eggs that are ideal for cutting and polishing. Mutton Mountain material is favored by collectors and lapidary artists alike for its vibrant color palette, strong internal contrast, and dependable cutting quality.
Rocks of the Cascades – Thundereggs, Tools & Tradition