Formula: (UO2)6(SO4)(OH)10.12H2O
Reflected/transmitted colour:
Pleochroism: Colourless (X), yellow (Y=Z)
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: a = 1.623, b = 1.625, g = 1.634
Bireflectance/Birefringence δ: 0.011
2V angle: 52° (calculated), large (measured)
Dispersion: Extreme, r > v to r < v
Optical orientation: X ≈ b, Y Ù c = 17-23°
Optical axial plane:
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