Formula: Cu2S
Reflected/transmitted colour: polished section bluish white, bluish streaks may be due to polishing
Pleochroism:
Optical isotropy/anisotropy: polished section weak to distinct anisotropy, emerald-green to light pinkish( strong illumination), straight extinction (apparent isotropy may be a result of too great pressure during polishing)
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section very weak
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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