Formula: (Mn,Mg)MgSi2O6
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.677, β = 1.684, γ = 1.692
Bireflectance/Birefringence δ: 0.015
2V angle: 88°
Dispersion:
Optical orientation:
Optical axial plane:
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