Vanadinite

Formula: Pb5(VO4)3Cl

Reflected/transmitted colour:

Pleochroism: light (ε), darker (ω)

Optical isotropy/anisotropy: Uniaxial

Optical sign: -

Refractive indices: ε = 2.35, ω = 2.416

Bireflectance/Birefringence δ: 0.066

2V angle:

Dispersion:

Optical orientation:

Optical axial plane:

 

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