home / agates worldwide / Northamerica / USA / California / Wiley Well - Black Agate Thunderegg Bed

“... The Black Agate thunderegg bed is located in the Wiley Well District near Blythe, in the Sonoran Desert of southeastern California. The thundereggs here can tend to be "massive", rather than perfect rounds or oblongs, similar to the Janos deposits in Mexico. Most of the agate is indeed black, with white opal and sometimes red bands interspersed...”

written by M. Ketsdever, Hillsboro, OR