Torbernite

Formula: Cu(UO2)2(PO4)2.8-12H2O

Reflected/transmitted colour:

Pleochroism: Dark green to sky-blue (O), green (E)

Optical isotropy/anisotropy: Uniaxial

Optical sign: -

Refractive indices: ε = 1.582, ω = 1.592

Bireflectance/Birefringence δ: 0.010

2V angle:

Dispersion:

Optical orientation:

Optical axial plane:

 

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