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Dwarves' Earth Treasures Museum:
Thundereggs from
Saxony, Germany
 .
    Coming from one of many thunderegg locations around Germany, the thundereggs of Et. Egidien and Hohenstein look quite similar and they may have been found in the similar beds that is close to each other. Considering the fact that they are quite coarse-grained, I can see how anyone can confused over whether those thundereggs came from coarse grained pertile lava flows or "welded tuff" even I think that they might be found in the pertile beds judging from the way the grains are oriented along the lava flow as well as opening of the cavities within those thundereggs.  The agates in Et. Egidien are typically bright red sometimes in color combo with orange, purple, yellow, brown and white. The funny thing about larger specimens are that their cavities tend to be more bioconoid ("eye/diamond") shaped as if the gases were struggling to expand against the overrall weight of the thunderegg itself .  Those from Hohenstein are similar in many respects except that the color of the thunderegg shells tend to be more consistent with more orangish to yellowish agates. It appears that the thunderegg site is closed, but it had been heavily mined resulting in one of most widely available thundereggs coming from Germany.

YOU CAN CLICK ON THE PICTURES TO SEE LARGER PICTURES

Rough Appearance:  Looks like dried and coarse-grained "clayballs" sometimes with agate ridges showing.
Hard to distingish between those from St. Egiden and Hohenstein except that the agaet in St. Egiden is supposedly more reddish.

Some shadowing effect, Et. Egiden, Saxony, Germany
Et. Egiden, Saxony, Germany
 Et. Egiden, Saxony, Germany
Gift from Toneys		 Classic Red color,
Et. Egiden, Saxony, Germany
 with iridescent layer, Hohenstein-Ernstthal
 Hohenstein-Ernstthal
Additional Information can be found at Eibonvale Thunderegg Gallery: Germany