Formula: Pb3(Ag,Cu)5Bi7S16
Reflected/transmitted colour: opaque, polished section white to gray-white
Pleochroism: weak to distinct
Optical isotropy/anisotropy: distinct to strong, from gray-white to red-brown and green
Optical sign:
Refractive indices:
Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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