This beautiful thunder egg half is from Richardson Ranch in Oregon. It has an agate core that is dark bluish-gray. The inclusions in this egg are bits of rhyolite lava, that are often referred to as moss. It has some areas of slight translucence. Roughly 3 in. x 2 1/4 in. The surface is polished to a glassy finish.
As a *BONUS* we will include our explanation for these very unusual formations.
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