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3.5 in Double Core Banded Turkish Agate Thunderegg

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3.5 in Double Core Banded Turkish Agate Thunderegg

Availability: Out of stock

Thunderegg Agate

Chubuk (North of Ankara), Turkey

Nodule : 3.5 in x 2.6 in

1 in = 2.54 cm / 1 cm = 0.39 in

A large banded agate nodule from the northern Ankara region of Turkey, this specimen shows great double cores of agate, an egg within another thunderegg!

Complete nodules like these are rarely offered and are typically cut or slabbed to make jewelry or other lapidary material.


Turkey is famous for the agates discovered there, many containing “stick agate” pseudomorphs (calcite and zeolite) inclusions. Found amongst the mountain hillsides and streams, many of these nodules have moss growing on them.

The zeolites had grown in the thunderegg cavities first, before being replaced and preserved by agate secondarily.