Formula: Pb8Hg3Se9
Reflected/transmitted colour: Cream to slightly beige with no internal reflections (RL)
Pleochroism: None
Optical isotropy/anisotropy: Weak to moderate anisotropic with rotation tints of steel blue to greenish brown
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ: Weak
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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