This rare, 30,000-year-old blue mammoth tusk was discovered in Alaska in 2017.

[u/GoldenChinchilla]

The blue coloration is believed to develop when animal remains that are low in iron but high in phosphates are buried in damp sediment that is rich in iron but poor in phosphates.

The tusk was reportedly put up for auction, although its estimated value was not disclosed.

[u/knowledgeable_diablo]

Thinking there would be some ivory carvers that would pay top dollar for this tusk to carve into something exotic.
Can’t be many tusks like this floating onto the market in a nice blue hue.