Lithophysa (Thundereggs) Photos
Cochise College
Photos of Rocks       
Igneous Rocks
Geology Home Page
Roger Weller, geology instructor                   copyright 2011


If the lithophysa occurs within an obsidian, as the obsidian breaks down and is
eroded away, the rounded structure is left intact and has been called a thunderegg.


lithophysa                                                                                                                                            2

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