Formula: Ca (UO2) (CO3)2 .5H2O
Reflected/transmitted colour:
Pleochroism: Colourless (x), colourless (y), light yellow (z)
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.536, β = 1.559, γ = 1.697
Bireflectance/Birefringence δ: 0.161
2V angle: 48° (calculated), 30-45° (measured)
Dispersion: r > v
Optical orientation:
Optical axial plane:
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