Formula: Ag2S
Reflected/transmitted colour: opaque, polished section gray with often a distinct greenish tint
Pleochroism:
Optical isotropy/anisotropy: distinct anisotropic, may sometimes appear isotropic, polished sections tarnished in air may appear somewhat more strongly anisotropic
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: very weak
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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