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

wellerr@cochise.edu    copyright 2007

lithophysa, cut to show structure

This thunderegg has been cut in half to show the internal structure.
Typically, the internal structure of a lithophysa appears to have undergone shrinkage,
creating open gaps that are then filled with agate material.

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