Formula: NiAs2
Reflected/transmitted colour: opaque, polished section white, considerably whiter than other Ni-Co-Fe arsenides
Pleochroism:
Optical isotropy/anisotropy: polished section strong anisotropic, especially in oil, showing pinkish, brownish, greenish and blue colours (not as strong as for safflorite and löllingite)
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section in air very weak, weaker than for safflorite, in oil more distinct, yellowish white to bluish white
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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