Formula: Ni3(Bi,Pb)2S2
Reflected/transmitted colour: opaque, polished section creamy white with a faint mauvish tint
Pleochroism: polished section perceptible
Optical isotropy/anisotropy: polished section strong anisotropy, greenish gray to yellowish brown or slate-blue o salmon-pink, depending on adjustment of the nicols
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section distinct, creamy white to grayish creamy white
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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