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

^ ^a ^b 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
^ ^a ^b Mindat, Akaogiite, http://www.mindat.org/min-35912.html
^ Mindat, TiO2 II, http://www.mindat.org/min-29114.html

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[American_Mineralogist-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

[Mindat_Akaogiite-2] Mindat, Akaogiite, http://www.mindat.org/min-35912.html

[Mindat_TiO2_II-3] Mindat, TiO2 II, http://www.mindat.org/min-29114.html

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