CMT158 Cold Mountain Thunderegg Specimen Copper All of the cabs shown

All of the cabs shown are cut and polished by hand in our lapidary shop in Cedarburg

The shells are preserved in marine rock

and pink agate

Each slab is unique and can have varying patterns of banding

and white banded agate with quartz and druzy center

CMT158 Cold Mountain Thunderegg Specimen Copper All of the cabs shownA polished specimen featuring reddish brown, dusty peach tan, and translucent, blue gray chalcedony filling the thunderegg fracture pattern. 3. 75" x 3" x 2" 13. 1 oz Cold Mountain Thundereggs are from the Sierra Mountains in Mexico. The thundereggs can contain water banding and feature red, mauve, or black webbing. While technically a rhyolite due to its thunderegg nature, Cold Mountain Thundereggs are highly silicate and feature large amounts of