Thunder Eggs (Lithophysa) Split and Polished Pairs ALL Fluoresce

A thunderegg (or thunder egg) is a nodule-like rock, similar to a filled geode, that is formed within rhyolitic volcanic ash layers.  Thundereggs are rough spheres, or elongated masses. They usually contain centres of chalcedony which may have been fractured followed by deposition of agate, jasper or opal, either uniquely or in combination. Also frequently encountered are quartz and gypsum crystals, as well as various other mineral growths and inclusions. Thundereggs usually look like ordinary rocks on the outside, but slicing them in half and polishing them may reveal intricate patterns and colours. A characteristic feature of thundereggs is that (like other agates) the individual beds they come from can vary in appearance, though they can maintain a certain specific identity within them.  Thunderegg is not synonymous with either geode or agate. A thunderegg is a specific geological structure. 

Thundereggs are claimed to anchor scattered energy and connect you to the physical foundation of the earth. Just as a plain volcanic exterior hides a brilliant crystal core, the stone represents discovering your own unseen talents and true worth.  They teach that "energy follows attention," helping to gather a wandering mind and direct your drive purposefully.  The stone eases internal and external harshness, calming anger and encouraging cooperation. Primarily links to the Root Chakra for stability and the Sacral Chakra for creativity and vitality and they are associated with Earth (stability) and Fire (volcanic transformation).