The canard raised by the question probably stems from a misunderstanding about museum displays of dinosaur skeletons. Most mountings are composed of resin casts of fossil bone instead of the actual petrified bone. read more
In the past, the Natural History Museum of Utah has opened the back of the house for a weekend of Behind the Scenes, pulling the collection drawers open for visitors to see that dinosaur fossils are real. read more
Fake fossils can be pretty convincing to the average impulse-buyer. That’s not to say fake fossils are unheard of in professional circles. Over the past few decades, it has become more common for amateur collectors to find fossils and sell them to museums for money. read more
The "dinosaur bone" was really a concretion, or a small lump of mineral that had formed around some bit of detritus. A broken part of the object made the identification easy. The exposed internal structure was compact, uniform, and smooth. It entirely lacked any sign of internal bone structure that a real dinosaur bone would exhibit. read more