Formula: CuFe2S3
Reflected/transmitted colour: opaque, polished section creamy gray or pale brown, brass to bronze yellow
Pleochroism:
Optical isotropy/anisotropy: polished section strong (but not as strong as for pyrrhotite) anisotropy, pinkish brown, grayish blue, basal sections are less anisotropic. Sections perpendicular to (001) can show on close examination very fine lamellae
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section distinct (in oil), creamy gray to brownish gray
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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