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Dwarves' Earth Treasures Museum:
Secret Ridge Thundereggs
Secret Ridge Mine (Harney Rim), Burns,  Oregon
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Not much know about this site yet, need to do some research.

YOU CAN CLICK ON THE PICTURES TO SEE LARGER PICTURES

Rough Appearance:  Gray with faint greenish tint with stand-out flow bands and "bubbles"
Agates  are typically clear with gray to white bandings, waterline features common.

 
Typical Thunderegg
Thanks to Anton K. for those pair. :)