Formula: NiAs2
Reflected/transmitted colour: opaque, polished section pure white, smoother and whiter than associated white arsenides
Pleochroism:
Optical isotropy/anisotropy: polished section strong anisotropic, but not as strong as for rammelsbergite, and usually without bluish colours
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section very weak, distinct in oil, //elongation yellowish white, ┴ elongation bluish white
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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