Formula: U2V6O21.15H2O
Reflected/transmitted colour:
Pleochroism: Light brown (X), dark brown (Y), yellow green (Z)
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.817, β = 1.879, γ = 2.057
Bireflectance/Birefringence δ: 0.240
2V angle: 52° (measured)
Dispersion: r > v
Optical orientation:
Optical axial plane:
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