Chinese paleontologists discovered this crystallized dinosaur egg while restoring a nest found last year on Qinglong Mountain in Hubei Province. Crystallized egg fossils are extremely rare due to the harsh environmental conditions required for their formation. Fossil dinosaur eggs dating back to the mid-Cretaceous period 60 to 80 million years ago were first discovered on Qinglong Mountain in 1995. To date, researchers have found about 3000 mostly well-preserved dinosaur eggs on the surface.