Polymorph of titanium di-oxide or TiO2
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Other forms are Anatase and Brookite.
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It is formed by quasi-HCP packing of anions.
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Half of the octahedral sites are filled by cations.
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The resulting structure has a tetragonal crystal structure due to a slight distortion in the lattice.
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Anisotropic diffusion properties of cations are found in TiO2.
Materials shows large and anisotropic refractive index and high birefringence.
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TiO2 is often used as pigments and is non-toxic.