Formula: CaTiSiO4(O,OH,F)
Reflected/transmitted colour: colourless, yellow or typically brown
Pleochroism: coloured varieties may be moderately pleochroic, e.g. α pale yellow, β brownish yellow, γ orange-brown
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: α = 1.843-1.950, β = 1.870-2.034, γ = 1.943-2.110
Birefringence δ: 0.100-0.192
2V angle: 17-40°
Dispersion: r > v, strong
Optical orientation: γ Λ z = ~ 51°
Optical axial plane: (010)
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