From mastodon ivory to gemstone: The origin of turquoise color in odontolite

@article{Reiche2001FromMI,
  title={From mastodon ivory to gemstone: The origin of turquoise color in odontolite},
  author={I. Reiche and C. Vignaud and B. Champagnon and G. Panczer and C. Brouder and G. Morin and V. A. Sol{\'e} and L. Charlet and M. Menu},
  journal={American Mineralogist},
  year={2001},
  volume={86},
  pages={1519 - 1524}
}
Abstract Heat-induced color changes of fossilized Miocene mastodon ivory (13-16 Ma) have been known at least since the Middle Ages. Cistercian monks are believed to have created odontolite, a turquoise- blue “gemstone,” by heating mastodon ivory found in Miocene geological layers next to the Pyrrenean chain, France, to use it for the decoration of medieval art objects. This material has been the object of investigations of famous European naturalists and gemmologists, among them Réaumur (1683… Expand
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