Formula: Tl6(Fe,Ni,Cu)25S26Cl
Reflected/transmitted colour: Brown in air, dark brown in oil (RL)
Pleochroism:
Optical isotropy/anisotropy:
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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