Europe
Besides Germany there are mayn other countries with source for thundereggs in Europe. Most of them are located in the eastern part, but there are also known and probably more unknown locations in the western parts as well.
Cause of the vast amount of locations, France and Poland are seperated.
Sources:
Bulgaria
- Rabovo
Greece
- Lesbos
Hungary
- Kishuta
- Monok
Romania
- Dumbrava
- Techereu - Brad
Slovakia
- Brezina
- Bysta
United Kingdom
- Isle of Jersey - Bouley Bay ("Pyromerides")
- Stockdale (var. locations)
- Wales
- Conwy Mountain
- Pen-Y-Chain
- Skomer Island
- Central Caernarvonshire (var. locations)
Złł
Bulgaria
size: 51x64 mm
Very interesting thunderegg from Rabovo in the Rhodopi Mts. The green stuff seems not to be jasper, but some kind of mixture of various minerals.
Greece
size:
Nice and typical large lithophysae agate from Lesbos/Lesvos. Nowadays those are difficult to get cause the area is under protaction. This agate shows a nice chalcedony filled cavity and some blueish white cloud agate.
Hungary
size:
This thunderegg is supposed to be from the rarely seen location Kishuta in Hungary. This one is not proofed but the material should come from perlite outcrops near this town.
Another quite new location (in terms of hte thunderegg habit) is Monok. The eggs are usually filled with lower chalcedony and with hyalite crystals. You can get them in several sizes from 120 to 50 mm in diameter but normally only broken up, not cut.
Romania
The location of Dumbrava was a long time known as Cluj-Napoca which is the next city to that source. The thundereggs are usually small with haematite dots in the red banding. Other colors are more rare.
#1: 40x40 mm
Slovakia
size:
That egg is from the location called Brezina. Most eggs show some nicely banded blueish agate.
size:
The other known location for lithophysae agate in Slovakia is called Bysta (near Brezina). This egg looks like hydrothermal and has a nice chalcedony filled druzy in greyish-blue.