Formula: Cu9S8
Reflected/transmitted colour: RL blue, blue with a slight violet tint in oil
Pleochroism: Blue to bluish white
Optical isotropy/anisotropy: Strong, orange-red
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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