Formula: Pb2Ag3Sb3S8
Reflected/transmitted colour: white to grayish white
Pleochroism:
Optical isotropy/anisotropy: strong anisotropic, brownish gray to dull purplish gray, oblique extinction
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ: distinct on grain boundaries and at contacts of twin lamellae, white to lemon yellow
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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