Fossil Type: Opalized Bivalve Fragment Geological Age: Cretaceous Location: Coober Pedy, Australia Size: Approx. 26*15*10 mm Weight: Approx. 3.2g Condition: Natural, partial shell preserved, minor surface pitting This is a fossil fragment of a bivalve shell that has undergone replacement by opal, a process known as opalization. The specimen displays a subtle play-of-color on the surface, visible under proper lighting, along with the original shell structure partially preserved in the matrix. Such opalized fossils are rare, as they require unique geological conditions involving silica-rich fluids, low permeability sediment, and precise mineral replacement. This piece represents a fascinating combination of paleontology and gemology, ideal for collectors interested in both natural history and precious minerals. The bivalve shell fossil can be prepared by blasting, can show more detail and color luster. Photographed under wet condition to reveal color and texture. Ships with protective packaging to ensure safe delivery.