Formula: FeSb2S4
Reflected/transmitted colour: polished section white-gray with a pinkish or brownish tint
Pleochroism: marked
Optical isotropy/anisotropy: polished section very strong anisotropy, about same as for stibnite, but colours are more vivid. Sharp extinction
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section strong and characteristic //α brownish pink, //β gray-white, //γ white
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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