Formula: Tl2(Cu,Fe)4S4
Reflected/transmitted colour: Rose-gray to pale lilac (RL)
Pleochroism: Weak, in pale gray with brownish lilac tint to dark gray
Optical isotropy/anisotropy: Moderate anisotropic, pale yellowish to very dark gray
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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