Formula: (Sc,Y)2Si2O7
Reflected/transmitted colour:
Pleochroism: Deep green (X), brownish yellow (Y=Z)
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.756, β = 1.793, γ = 1.809
Bireflectance/Birefringence δ: 0.053
2V angle: 64° (calculated), 60-65° (measured)
Dispersion:
Optical orientation: X ⋀ c = 5°
Optical axial plane:
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