Formula: Bi2U2O9.3H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.959, β = 1.981, γ = 2.060
Bireflectance/Birefringence δ: 0.101
2V angle: 58° (calculated), 56° (measured)
Dispersion: Strong, r < v
Optical orientation: X = a, Y = b, Z = c
Optical axial plane:
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