Formula: Ag8SnS6
Reflected/transmitted colour: gray-white with violet tint in air, much darker in oil, no internal reflections
Pleochroism:
Optical isotropy/anisotropy: some spec. are isotropic, others are weakly anisotropic, with bluish gray polarization colours
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ: commonly observable, more distinct in oil than in air, grayish white to yellowish gray
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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