Formula: Pb20Sn2(Bi,As)22S54Cl6
Reflected/transmitted colour: RL white
Pleochroism: RL not visible
Optical isotropy/anisotropy: RL weak
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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