Formula: (Ag,Cu,Fe)12(Sb,As)4S13
Reflected/transmitted colour: opaque, polished section gray, in oil with a faint yellowish brown tint, brownish red internal reflections not uncommon, but scarcely spread
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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