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Akaogiite (IMA symbol Aka) is an exceedingly rare mineral, one of the natural forms of titanium dioxide (TiO₂). It is a high-pressure polymorph of TiO₂, along with anatase, brookite and another high-pressure phase called "TiO₂ II". Rutile is the stable polymorph of TiO₂, most commonly found at standard temperatures and pressures.

Akaogiite can be found at the Nördlinger Ries Crater, a meteor crater in Germany, where the extreme pressure during the impact allowed its formation.

References

1. Warr, L.N. (2021). "IMA-CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
2. ^ 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
3. ^ Mindat, Akaogiite, http://www.mindat.org/min-35912.html
4. Mindat, TiO2 II, http://www.mindat.org/min-29114.html

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