Formula: (Ba,Pb,Fe)(UO2)2(WO4)(OH)4.12H2O
Reflected/transmitted colour:
Pleochroism: Nearly colourless (X), yellow (Y=Z)
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: a=1.682, b=1.845, g=1.855
Bireflectance/Birefringence δ: 0.173
2V angle: 24 (calculated), 42 (measured)
Dispersion: r > v
Optical orientation: X = b
Optical axial plane:
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