Titanium Dioxide: TiO2. It occurs in nature in five different crystal forms: Rutile, Anatase, Brookite, and the two very high-pressure polymorphs (by impact from meteorites) Akaogiite and TiO2 II, which can be colored due to impurities in the crystal. Rutile is the most common form: each Titanium atom is octahedrally surrounded by six Oxygen atoms; Anatase has a tetragonal structure, more elongated than that of Rutile, while Brookite has an orthorhombic structure.
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