Lithophysa (Thunderegg) Photos
Cochise College
Photos of Rocks      Igneous Rocks
Virtual Geology Museum       Hall of Rocks
Geology Home Page
Roger Weller, geology instructor

lithophysa (thunderegg), polished-A
This is a very typical thunderegg from Oregon.
The internal cavity has been completely filled with agate.

Photo is copyright free for non-commercial educational uses.
Just credit photo to R.Weller/Cochise College.