Gem Chalcedony Pseudomorph After Fluorite

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These beautiful specimens are rare survivors of a small find that produced GREAT carving rough for cabochons and jewelry made of chalcedony (its gemmy and transparent/translucent!), to the detriment of the original specimens from our point of view! Charlie saved some from the wrecker, though, and these are a few selected from a flat we have of this rare and beautiful old material from the 1980s. This one is particularly nice because it shows the lace agate in layers around the chalcedony, that provided the silica for replacement of the fluorite crystals that were originally inside this vug. In other words, this piece preserves the full geological context of the pocket, with crystals in a vug in the ground, changing over timeto another mineral due to alterations in the chemistry and environment. Besides, its beautiful, too!