Formula: Cu12(Te,Sb,As)4S13
Reflected/transmitted colour: opaque, polished section grayish white with a faint borwnish tint (in air)
Pleochroism:
Optical isotropy/anisotropy: polished section isotropic
Optical sign:
Refractive indices:
Birefringence δ:/bireflectance:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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