Akaogiite

Akaogiite is an exceedingly rare mineral, one of natural forms of titanium dioxide. It is the high-pressure polymorph of TiO2, polymorphous with anatase, brookite and another high-pressure phase called "TiO2 II". [1][2][3]

It can be found at the Nördlinger Ries Crater, a meteor crater in Germany, where the extreme pressure during the impact allowed its formation.[1][2]

References
  1. El Goresy, A., Dubrovinsky, L., Gillet, P., Graup, G., and Chen, M., 2010: Akaogiite: An ultra-dense polymorph of TiO2 with the baddeleyite-type structure, in shocked garnet gneiss from the Ries Crater, Germany. American Mineralogist 95(5-6), 892-895
  2. Mindat, Akaogiite, http://www.mindat.org/min-35912.html
  3. Mindat, TiO2 II, http://www.mindat.org/min-29114.html
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