Formula: Bi4(UO2)(AsO4)2O4.2H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.871, β = 1.975, γ = 2.005
Bireflectance/Birefringence δ: 0.134
2V angle: 54° (calculated), 52° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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