Formula: Ni9Bi(Sb,Bi)S8
Reflected/transmitted colour: opaque, polished section depending on the surroundings varying from grayish brown to creamy yellow
Pleochroism: polished section, very weak in air, more distinct in oil
Optical isotropy/anisotropy: polished section distinct to strong anisotropic, brown and blue-gray tints, parallel extinction
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section weak but distinct
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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