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Dwarves' Earth Treasures Museum:
Chubuk Thundereggs
from several agate sites around Chubuk (north of Ankara), Turkey
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    Turkey is renowned for the agates containing pseudomorphs (calcite and zeolites) and sagenite inclusions.  The agates are actually forms of thunderegg cores which the shells have mostly been eroded away as a result of exposure to weathering for millennia, and it is uncommon to find any agate cores with thunderegg shells still attached to them. The cores were dug from the several meters of clay layers that has been decomposed from the pertile(rhyolitic) lava beds.
     The zeolites possibly laumonite sometimes encrusted with calcite have grown in the thunderegg cavities before being replaced and preserved by the gentle growth of agate. The colors tend to come in white, yellow, light blue, brown, and black. Occasionally, the agates with red to yellow colors have been found.  Some thundereggs contain highly contrasting white and black "waterline" layers. More information on the turkish agates can be found at Euro-Bir website.

YOU CAN CLICK ON THE PICTURES TO SEE LARGER PICTURES

Rough Appearance: Rough agate shapes that is lacking "polygens" structures typical of thundereggs,
Some gray thundereggs have heavily pitted shells. Needle/blade-like structures may show on exposed faces.
Typical thunderegg with psuedomorphs Typical thunderegg
Outstanding agate. Gift from Euro-Bir website.

You can see some Chubuk Thundereggs for Sale at the Online Agate & Thunderegg Shop