BST102pr Blue Star Thunderegg Specimen Pair Polyhedroids 25" polished face

25" polished face

featuring naturally flat surfaces at a variety of different angles

or sometimes a deep blue that appears black

" The cracks vary in shape and volume

Approximately 2" base

BST102pr Blue Star Thunderegg Specimen Pair Polyhedroids 25" polished faceThese polished halves of a Blue Star Thunderegg show botryoidal chalcedony coated in sparkling crystal druzy, inside feathery banded agate in clear to pale blue hues. The shape of the chalcedony comes to several pointed edges like a star, with brown rhyolite making up the rest of the egg. The chalcedony shows green fluorescence under 365nm ultraviolet light. Polished Surface: 6. 6cm x 5. 5cm and 6. 8cm x 5. 6cm Approx. 1" and 1. 5" deep 9. 1oz Blue