11-1/2" Pyritized Ammonite PairPyritized Ammonites are considered some of the most collectable type of Ammonite fossil specimens. Iron Pyrite, also known as "Fool's Gold" enters the Ammonites chambers, replacing the animal's structure cell by cell. When the cellular replacement process goes just right, a magnificent fossil specimen such as the one pictured is created. The name Pyrite is derived from the Greek (purits), "of fire" or "in fire," from (pur), "fire. Ammonites are an