Formula: Ca3Mg(SiO4)2
Reflected/transmitted colour: colourless
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: α = 1.702-1.710, β = 1.710-1.714, γ = 1.718-1.728
Birefringence δ: 0.008-0.021
2Vγ angle: 66-76°
Dispersion: r > v, weak
Optical orientation: α Λ z = 13°, β = y
Optical axial plane: (010)
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