FMF - Friends of Minerals Forum, discussion and message board

[mihailovici79]

Thunder egg, Romania. Its beautiful, trust me :).

[Tracy]

Um...I think "thunder egg" is a local term that describes agate nodules (or sometimes geodes) from Pacific Northwestern US. To the rest of the world, they are simply agate nodules (or geodes).

Also, a nodule from Romania does not belong on the Oregon US specimens page - ? ;-)

- Tracy

[Jordi Fabre]

[marvsT/Nminerals]

Because thundereggs are not minerals, and because they are so well known from the Pacific Northwest it is easy to suppose that something similar from Europe would not be such. However, thundereggs are known from most of the western states as far south as Arizona and throughout the world especially among our lapidary brethren. Wikipedia has photos of them from France and Germany. Thunderbird Park at Mt Tamborine in Queensland, Australia bills itself as the "world’s largest thunderegg mine". Of course they do not call it rockhounding; they call it "fossicking". Cheers! Marv

[nicu]

Mihail,
For complete references you may contact geologist Emil Spiac from Arad city, one of the best Romanian researchers in this domain.
Thunder eggs are the state rock of the State of Oregon.