4.67" Fossil Clam With Fluorescent Calcite - Rucks’ Pit, FL

This is a 4.67" wide fossil clam (Mercenaria permagna) from the world-famous Ruck's Pit quarry near Okeechobee, Florida. The shell has almost entirely been replaced with calcite that is fluorescent under UV. There are also other calcified shell fragments buried in the matrix, visible on the other side.