Formula: (Cu,Hg)11Sn4S16
Reflected/transmitted colour: RL greenish gray to light gray with greenish-brownish tint
Pleochroism: RL weak
Optical isotropy/anisotropy: RL moderate
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ: RL insignificant
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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