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This is a fluorescent, Pleistocene age (approx. 1-2 mya) Mercenaria permagna clam fossil from the famous Rucks' Pit site in Fort Drum, Florida. During the fossilization process of these clams, the calcium carbonate from the original shell material dissolved and recrystalized as beautiful, honey-colored, scalenohedral, calcite crystals on the interior of the shell. The resulting calcite is brightly fluorescent under all wavelengths of UV, and also displays a short-lived green phosphorescence. The exterior of the shell is encrusted with the coquina from which it was removed.
A major component of rock collecting (for us) is simply getting out in nature. A buddy dragged us out to a very remote area here in middle Tennessee to hunt for fluorescent green agate. Since we consider ourselves pure "Glow Hounds" we weren't anticipating any glow rocks, just the beauty of the area, but we brought our UV lights anyway.
