The specimen below is a fossil clam. The species is Mercenaria permagna. It is from Ruck's Pit, Okeechobee County, Florida. It lived during the Pliocene through Pleistocene Periods.
The first image was taken under long wave ultraviolet light. The fluorescent mineral represented here is calcite. It fluoresces a creamy white under long wave ultraviolet light.
The photo below was taken under short wave ultraviolet light. The calcite fluoresces a bluish to greenish white under short wave light.
To see a picture of this specimen under normal lighting conditions, return to the fossil section. Look for the same product number followed by an "N." To see other fluorescent material from this location, return to the main fluorescent page and select the link "To view specimen material from Florida."
Mercenaria permagna fossil clam with calcite 
Quantity in Basket: None
Code: FLC-104
Price: $70.00
Shipping Weight: 0.73 pounds
Time: Pliocene-Pleistocene, 10 million to 10,000 years ago.
Location: Ruck's Pit, Okeechobee County, Florida
Minerals: Calcite
Size: 3-5/8" x 3-1/2" x 1-7/8"