Formula: (Cu,Ag)6PbS4
Reflected/transmitted colour: Creamy yellow tint (RL)
Pleochroism: Weak (RL)
Optical isotropy/anisotropy: Moderate, from light yellow to dark brown (RL)
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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