20388 Extremely Beautiful 5.19 Inch Brazilian Agate Slice (Chalcedony Geode Section) Perisphinctes It has been carefully prepared It has been carefully prepared during a long laboratory process Impressive huge vertebra of this species of Elasmosaurus in its phosphatic matrix they are classically associated with volcanic rocks and can be common in certain metamorphic rocks The stone has been soaked in a dye solution which allows the natural agate to absorb the colorations
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