Formula: Ag4SeS
Reflected/transmitted colour: polished section bright lead gray with very faint greenish tinge
Pleochroism:
Optical isotropy/anisotropy: very weak, shades of gray, or isotropic
Optical sign:
Refractive indices:
Birefringence δ: not observable or very weak
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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