Vincentite

Formula: (Pd,Pt)3(As,Sb,Te)

Reflected/transmitted colour: RL light brownish gray

Pleochroism: RL weak

Optical isotropy/anisotropy:

Optical sign:

Refractive indices:

Bireflectance/Birefringence δ: RL weak, from greenish gray to dark brown

2V angle:

Dispersion:

Optical orientation:

Optical axial plane:

 

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