Formula: (Fe,Ni)9S11
Reflected/transmitted colour: opaque, polished section pinkish cream
Pleochroism: strong
Optical isotropy/anisotropy: polished section strong anisotropic, yellow to blue-gray
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section strong, grayish yellow to reddish brown, noticeably stronger than for pyrrhotite
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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