Formula: FeSbS
Reflected/transmitted colour: opaque, polished section white, in oil with a pinkish tint
Pleochroism: distinct
Optical isotropy/anisotropy: polished section strong anisotropic, like arsenopyrite, with clear colours, white, gray, green, blue, black, purple, pink and brwon
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section in oil distinct, //c (// striation of the prism) pure white, sometimes with a faint green tint, //a (darkest) faint pinkish, similar to pyrrhotite but brighter, //b pinkish white
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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