Formula: Sb2O3
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: a = 2.18, b = 2.35, g = 2.35
Bireflectance/Birefringence δ:
2V angle: very small (measured)
Dispersion: r < v or r > v
Optical orientation: X = a, Y = b, Z = c
Optical axial plane:
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