Formula: Ca(UO2)2[SiO3(OH)]2.5H2O
Reflected/transmitted colour:
Pleochroism: Weak, colourless (X), pale canary-yellow (Y), canary-yellow (Z)
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: a = 1.643, b = 1.666, g = 1.669
Bireflectance/Birefringence δ: 0.026
2V angle: 38 (calculated), 32-45 (measured)
Dispersion: Relatively strong, r < v
Optical orientation: Z = b, X ^ {100} cleavage or a flat surface
Optical axial plane:
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