Formula: SnTa2O6
Reflected/transmitted colour: Yellow
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 2.39, β = 2.42, γ = 2.52
Bireflectance/Birefringence δ: 0.13
2V angle: 60° (calculated), 25-35° (measured)
Dispersion:
Optical orientation: Y = b, Z ⋀ c = 27°
Optical axial plane:
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