Formula: Cu31S16
Reflected/transmitted colour: gray, very similar to chalcocite
Pleochroism:
Optical isotropy/anisotropy: weak anisotropy, very similar to chalcocite
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: very similar to chalcocite
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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