Formula: Zn12(UO2)Ca(CO3)3(OH)22.4H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.563, β = 1.621, γ = 1.621
Bireflectance/Birefringence δ: 0.058
2V angle: 0° (calculated), 50-66° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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