Formula: TiO2
Reflected/transmitted colour: yellow or brown
Pleochroism: very weak, in yellow and brown
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: α = 2.583, β = 2.584-2.586, γ = 2.700-2.741
Birefringence δ: 0.117-0.158
2V angle:
Dispersion: strong, variable
Optical orientation: α = z, β = x, γ = y in blue light, α = x, β = z, γ = y in red light, Bxa always ┴ (010)
Optical axial plane:(100) for blue light, (001) for red light
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