Formula: PbU7O22.12H2O
Reflected/transmitted colour:
Pleochroism: Nearly colourless (x), yellow-orange to golden yellow (y=z)
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: a = 1.780, b = 1.850, g = 1.860
Bireflectance/Birefringence δ: 0.080
2V angle: 40 (calculated), 60 (measured)
Dispersion: Strong, r > v
Optical orientation: X = c, Y = b, Z = a
Optical axial plane:
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