Formula: (Y,Yb)2Si2O7
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.713, β = 1.748, γ = 1.758 (Y), α = 1.723, β = 1.758, γ = 1.768 (Yb)
Bireflectance/Birefringence δ: 0.045
2V angle: 54° (calculated), 55-56° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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