Crystal Filled Clam Fossil - Rucks Pit
Ruck's Pit was a small cement quarry, that for several years in the early 2000's produced some amazing crystal lined fossils. The quarry has been shut down and filled in with water for several years, so these fossils are no longer being found. Because of this it's difficult to acquire these remarkable crystal filled fossil shells, particularly ones of high quality such as this one.
A geological paper on they unique geology and fossil occurrences in Ruck's Pit can be found here.