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The term Schorl was in use before the 1400s
70mm diameter (2
bowl: 8" x 6
an effect called chatoyancy
BST113pr Blue Star Thunderegg Specimen Pair Arrowheads The term Schorl was inThese polished halves of a Blue Star Thunderegg show an open cavity of botryoidal chalcedony coated in sparkling crystals, with pointed edges extending to the outer edges of the nodule. 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: 8. 8cm x 6. 5cm and 8. 9cm x 6. 7cm
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