Opalized Dinosaur Tooth

Photo: Carl Bento/Australian Museum...  ...'ve seen fossils in museums, but what about this: opalized dinosaur tooth. Opalized fossils occur when silica settled into cracks...  ...in the dinosaur bone and then hardened into opal . This one above is a particu...

http://www.neatorama.com/2013/01/28/Opalized-Dinosaur-Tooth/