Formula: TlHgSb4S7
Reflected/transmitted colour: RL pale gray with rare blood-red internal reflections
Pleochroism: RL weak
Optical isotropy/anisotropy: RL moderate to strong, purple, purplish brown-gray, brownish yellow, greenish yellow, sage-green, bluish green, dark blue-bottle-green
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ: RL weak to moderate
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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