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The Thundereggs introduced here are traded in the North American area as Coyamo agates, in order to  the well-known and high-estimated Coyamito agate and to affect so the purchase behavior of interested collectors. At present they are not to be purchased as rare and on the market in good quality and for a reasonable price.

These Lithophysae agates show in their center star shaped patterns of  fine banded agate. Their skin is relatively smoothly and is showing a brownish-reddish colour.