Uranocircite

Formula: Ba(UO2)2(PO4)2.12H2O

Reflected/transmitted colour:

Pleochroism: Colourless (X), pale canary yellow (Y,Z)

Optical isotropy/anisotropy: Biaxial

Optical sign: -

Refractive indices: a = 1.574, b = 1.583, g = 1.588

Bireflectance/Birefringence δ: 0.014

2V angle: 72 (calculated), 70 (measured)

Dispersion:

Optical orientation:

Optical axial plane:

 

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