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Dwarves' Earth Treasures Museum:
Black Agate Thundereggs
Wiley Well Site, south of Bythe, California
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   Coming from one of supposedly many thundereggs sites around Wiley Well, California, the Black Agate site was opened by Paul "GeodeKid" Calburn and the strange thing about the Black Agate thundereggs is that they are often connected to each other by narrow rhyolitic chains just like "trains". The agates in the thundereggs are typically "waterline" with white to dark colors and some has been found with tubes or "eyes" structures.

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Rough Appearance: Rough thundereggs that looks more like concertions than thundereggs, some were connected to each other like trains.
Typically contain black to whtie waterline agates, sometimes with tubes/"eyes" structures.

With calcite crystal at the bottom.