Pyritized Ammonite Fossil Bead measures approximately 37x29x18mm in size, the fossil has a metallic luster, the Pyritized Ammonite fossil is the result of Pyrite (iron sulfide) entering the structure of the Ammonite skeleton over millions of years to create a fossilized form, the fossil has the full spiral structure of the Ammonite on the front and has a polished back, the bead has been drilled as shown in the photograph, the Pyritized Ammonite Fossil is a stunning metallic fossil with a detailed structure, and the ancient Romans believed a pyritized ammonite under your pillow would bring prophetic dreams!