Agatized Dinosaur Bone or "dino bone" is the result of fossilized bone from dinosaurs in which the cellular structure has been replaced with quartz, leaving the bone structure intact. The resulting stone is a 7 on the Mohs scale. Many excellent specimens of dinosaur bone are found in and around the American southwest. Dinosaur bone ranges in color from brown to black with splotches of red, blue and bright yellow. Dark yellow-gold and red dinosaur bone is also found, but is more rare. The coloring of the specimen is due to impurities that were in the surrounding sediment. It is illegal to collect dino bone on US state or federal lands thus making agatized dinosaur bone more valuable.