Formula: TlAg2Au3Sb10S10
Reflected/transmitted colour: gray-blue
Pleochroism: weak, from gray-blue to slightly greenish gray-blue
Optical isotropy/anisotropy: distinct to moderate anistropic, from buff to slate gray
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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