Formula: Mg2SiO4
Reflected/transmitted colour: colourless
Pleochroism: -
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: α = 1.635, β = 1.651, γ = 1.670
Birefringence δ: 0.035
2V angle: 82°
Dispersion: r > ν (over α)
Optical orientation: α = y, β = z, γ = x,
Optical axial plane: (001)
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