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some filled with pale yellow calcite
and six sides coming to a terminated point
and gray jasper for the surrounding frame
The visible agate contains lacy patterning in bright red over a yellow background with faint banding
BST121pr Blue Star Thunderegg Specimen Pair Tabasco Geodes some filled with pale yellowThese polished halves of a large Blue Star Thunderegg show two sections of open chalcedony cavities coated in sparkling crystal druzy, surrounded by translucent agate with pale blue feathery banding. The rest of the egg is made from gray and brown rhyolite, with patterning similar to petrified wood that radiates outward from the agate. The chalcedony shows green fluorescence under 365nm ultraviolet light. Polished Surface: 12. 2cm x 7. 4cm and 12. 2cm