Mystery Broken Thunderegg Rough - Botryoidal Center with Plume-Like Structures moss plume blue agate and today remains a favorite

and today remains a favorite among lapidary artists for its eye-catching color and polishability

As old stock material (collecting from public lands is now prohibited)

which creates some really captivating cabochons

It can have pseudomorphic tubes

Mystery Broken Thunderegg Rough - Botryoidal Center with Plume-Like Structures moss plume blue agate and today remains a favoriteMystery Broken Thunderegg Botryoidal Center with Plume Like Structure Old Stock Ochoco Collection This mystery old stock broken thunderegg shows what was once a botryoidal center with plume like structures. Exact bed is uncertain, but it came from a collection containing many old stock Ochoco thunderegg beds. A neat trimmer that could yield designer cabochons with a bubble polish showing the interior pattern and the botryoidal as a natural top.