Formula: Cu3FeS4 (?)
Reflected/transmitted colour: polished section reddish to yellowish gray
Pleochroism:
Optical isotropy/anisotropy: polished section extremely strong anisotropy, as decomposition product in bornite in 45° position vivid green, as crystals of hypogene origin in 45° grayish green
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: very strong, in air O reddish orange to red-brown, E, bright yellowish gray, same in oil but more vivid colours
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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