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Coyamo / Santa Ulalia Thundereggs

One of the kings of Mexican thunderegg and not particularly rare. The matrix is distinctly smooth and uniform, but ranging from a light tan to a rich chestnut, sometimes with fairly distinctive invasive staining. Sometimes they edge towards a granular texture. The majority of the cores seems to be hollow with thin agate bands, sometimes leaning towards cloud agate - but that is not to say that solid cores are rare, as can be seen below. The agate is usually white, grey and clear, but can also verge into the pink. Black intrusions and decay are also common.

 

Coyamo Thunderegg

Amazing Coyamo Thunderegg with Pink Agate

Classic Coyamo Geode

Coyamo Thunderegg

Irregular Coyamo Thunderegg

Coyamo Thunderegg

Tiny Coyamo Thunderegg

Coyamo Thunderegg

Coyamo Thunderegg With Striking White Agate

Coyamo Thunderegg

Extremely Bizarre Coyamo Thunderegg with Consolidated Debris

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