Formula: Ni5-xAs2
Reflected/transmitted colour: opaque, polished section pinkish bronze
Pleochroism:
Optical isotropy/anisotropy: polished section distinct to strong anisotropic, green and violet tints
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section weaker bireflectance than for niccolite or breithauptite
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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