Formula: Al(UO2)3(PO4)2O(OH).7H2O
Reflected/transmitted colour: Canary yellow
Pleochroism: Strong, colourless (X), canary-yellow (Y=Z)
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.649, β = 1.666, γ = 1.676
Bireflectance/Birefringence δ: 0.027
2V angle: 74° (calculated), 74° (measured)
Dispersion:
Optical orientation: X = b, Y = a, Z = c, negative elongation
Optical axial plane:
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