Formula: NiS
Reflected/transmitted colour: opaque, polished section pure yellow, brass- to bronze-yellow, tarnishes to iridescence
Pleochroism:
Optical isotropy/anisotropy: polished section strong anisotropic, straw- or lemon-yellow to a pronounced iris-blue and violet, straight but not complete extinction. Basal sections appear isotropic
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section in oil distinct, bright yellow to grayish yellow
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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