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Dwarves' Earth Treasures Museum:
Thundereggs of Bysta,
Slovakia Republic
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    I managed to obtain some thundereggs  from Slovakia Republic thru a trade with a guy from Slovakia Republic. All of the colors from that country are mainly colorless to light blue sometimes with yellowish tint as typical in many common agates and thundereggs.

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Rough Appearance: Smooth bubbly surface on unweathered thundereggs.
A mix of yellow and bluish black colors on cut thunderegg shells are dead giveaways.