Formula: Pb7(Cu,Ag)2Bi6S17
Reflected/transmitted colour: Galena white
Pleochroism:
Optical isotropy/anisotropy: Moderate, light gray, yellow-green, and light reddish brown to gray-black
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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