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

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