Utah Septarian Nodule Rough Chunk! Yellow Jacket Jasper Priday Opal Thundereggs are beautiful

Priday Opal Thundereggs are beautiful opal filled thundereggs from Oregon

you need to be under bright light

they are pretty neat

Message us after ordering and we'll do our best to select chunks with visible pattern as-is

These are 100% authentic fossil specimens from the world-famous Green River Formation in Wyoming

Utah Septarian Nodule Rough Chunk! Yellow Jacket Jasper Priday Opal Thundereggs are beautifulThis septarian nodule is from Utah. We've had a very high rate of gorgeous calcite and pattern within these, and a few from this mine that we've cut have even had ammonite fossils within. Septarian Nodules are round stones that were organic fossils that were devoured by bacteria and replaced with calcite! They can be geodes (hollow with calcite crystals), or solid with unique and interesting patterns! Most Septarian Nodules take an excellent polish