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