BST104pr Blue Star Thunderegg Specimen Pair Cold Mountain Thunderegg 10mm x 7mm x 5mm

10mm x 7mm x 5mm

fill the area beneath pseudomorph formations of previous calcite crystals

Black marcasite colors the bottom edge

Botswana Agate Cabochon with white

BST104pr Blue Star Thunderegg Specimen Pair Cold Mountain Thunderegg 10mm x 7mm x 5mmThese 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