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Reblogged by cstanhope@social.coop ("Your friendly 'net denizen"):

punkpaleo@sauropods.win ("H. Pettijohn") wrote:

Happy #FossilFriday, check out this Allosaurus fossil with amethyst growing at its center! It's likely water rich with silica and a touch of iron leeched into the bone during the fossilization process, allowing the growth of crystals over time. (1/2)
#paleontology #geology #dinosaur #allosaurus #science

Attachments:

• The end of a gray Allosaurus limb bone sits against black fabric, its open center facing the camera. Inside the bone, light purple amethyst crystals have grown in a pattern reminiscent of bone marrow. Below the fossil, an orange sign states, "Allosaurus fragilis with Amethyst". (remote)