Formula: (Cu,Fe)12Sb4S13
Reflected/transmitted colour: opaque, except in very thin splinters, cherry-red, polished section gray, varying with admixed elements, commonly with olive or brownish tint, brownish red internal reflections may be visible
Pleochroism:
Optical isotropy/anisotropy: isotropic, polished section isotropic
Optical sign:
Refractive indices: n ≥ 2.72
Birefringence δ/bireflectance:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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