Akaogiite

Akaogiite (IMA symbol Aka[1]) 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".[2][3][4] Rutile is the stable polymorph of TiO2, most commonly found at standard temperatures and pressures.

Akaogiite
General
CategoryMineral
Formula
(repeating unit)		(TiO2)
IMA symbolAka

Akaogiite can be found at the Nördlinger Ries Crater, a meteor crater in Germany, where the extreme pressure during the impact allowed its formation.[2][3]

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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