6.7" Agatized Dinosaur Bone (Gembone) Vertebra End Section

This is a partial vertebra of a sauropod dinosaur from the Morrison Formation which has been agatized. One side has been polished revealing a vibrantly colored internal cell structure.

Agatized dinosaur bone is a rare form of fossilized dinosaur bone where the original fossilized bone has been re-mineralized (replaced) with silica based compounds (agate, jasper, chalcedony, or opal). The agatized bone is either found as fragments on the surface from bones or partial bones that have long since been destroyed by exposure to the elements, or as broken and tumbled chunks in event layers of the quarry. It could have come from any of a number of dinosaurs from this formation, though sometimes based on cell size and outer appearance the type can be narrowed down.