Xanthoconite

Formula: Ag3AsS3

Reflected/transmitted colour: RL lemon yellow

Pleochroism:

Optical isotropy/anisotropy: Biaxial

Optical sign: -

Refractive indices: β = 3

Bireflectance/Birefringence δ:

2V angle: 34° (measured)

Dispersion: r < v

Optical orientation:

Optical axial plane:

 

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