Formula: Fe2SiO4
Reflected/transmitted colour: pale yellow
Pleochroism: α = γ = pale yellow, β = orange yellow, reddish brown
Optical isotropy/anisotropy: biaxial
Optical sign: -
Refractive indices: α = 1.827, β = 1.869, γ = 1.879
Birefringence δ: 0.052
2V angle: 134°
Dispersion: r > ν (over α)
Optical orientation: α = y, β = z, γ = x
Optical axial plane: (001)
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