Formula: CaMgSiO4
Reflected/transmitted colour: colourless
Pleochroism: -
Optical isotropy/anisotropy: biaxial
Optical sign: -
Refractive indices: α = 1.638-1.654, β = 1.646-1.664, γ = 1.650-1.674
Birefringence δ: 0.012-0.020
2Vα angle: 69-88°
Dispersion: r > ν
Optical orientation: α = y, β = z, γ = x
Optical axial plane: (001)
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