Formula: HAl(UO2)4(PO4)4.40H2O
Reflected/transmitted colour:
Pleochroism: Pale yellow (X), deep yellow (Y=Z)
Optical isotropy/anisotropy: Biaxial, anomalous
Optical sign: -
Refractive indices: α = 1.492, β = 1.511, γ = 1.521
Bireflectance/Birefringence δ: 0.029
2V angle: 70° (calculated), 69° (measured)
Dispersion: Strong, r > v
Optical orientation: X = c, Y = a, Z = b
Optical axial plane:
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