Formula: (Pb,Ca)U2O7.2H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: ?
Refractive indices: α = 2.05, γ = 2.09
Bireflectance/Birefringence δ: 0.04
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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