Crystals Rocks Minerals to Tempt and Tantalise You

What are Thundereggs?

natural thunderegg

Thunderegg Geological Structure

A thunderegg is a sphere-like geological structure which forms in lava flows.

The centre eventually splits to form a cavity which over time, fills with either chalcedony, agate, opal, jasper or quartz.  When the ordinary looking outer rock is broken open it reveals minerals within a self-contained centre.

Article Picture

The picture of the thunderegg is courtesy of Stan Celestian. The photo is clickable and redirects to the original non-compressed image.

Available Right Now
Online Support

Have a Question? Chat with Us.

Start Chat with