Formula: Pb9(Cu,Fe)Bi12S28
Reflected/transmitted colour: whitish gray, bluish gray in oil
Pleochroism: moderate to distinct
Optical isotropy/anisotropy: distinct in air, strong in oil
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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