Shark teeth that have been fossilized are frequently dark, although one would reasonably speculate if any sharks actually have dark teeth. The color can also be attributed to the environment in which the teeth were found, such as dark, muddy areas or areas with high concentrations of iron.
What Elements Cause A Shark’s Fossilized Teeth To Be Black?
When acidic sediments touch a shark tooth, the enamel gets eroded. This exposes the collagen-rich dentine and cementine, which contain phosphate.
This phosphate comes in various colors based on the type of phosphate. The most common color is jet black, but you can also find it in shades of gray, brown, white, yellow, and red.
As acidic sediments erode the enamel, more phosphate gets exposed. This process creates the unique patterns and colors of shark teeth fossils.
How Long Do Shark Teeth Fossilize Before turning black?
Shark teeth fossilize over thousands of years, with their color varying over time. Teeth buried deeper in sediment take much longer to fossilize. Initially, newly fossilized shark teeth are white or tan.
Teeth gradually turn black over time due to exposure to elements. This process can take thousands of years, depending on the burial environment. Learn more here.
