BST104pr Blue Star Thunderegg Specimen Pair Cold Mountain Thunderegg Black marcasite colors the bottom

Black marcasite colors the bottom edge

and brown plumes

Stone: 21mm x 43mm

and khaki green and brown patterning beneath

Botswana Agate Cabochon with white

BST104pr Blue Star Thunderegg Specimen Pair Cold Mountain Thunderegg Black marcasite colors the bottomThese polished halves of a Blue Star Thunderegg show cavities with botryoidal chalcedony coated in sparkling crystal druzy, inside feathery banded agate in clear to pale blue hues. The rest of the egg is made up of brown rhyolite surrounding the agate and chalcedony, with a few distinct star points extending to the edges. The chalcedony shows green fluorescence under 365nm ultraviolet light. Polished Surface: 8. 3cm x 5. 2cm and 8. 4cm x 5. 4cm