Formula: NiSb
Reflected/transmitted colour: opaque, polished section pink with a violet tint
Pleochroism:
Optical isotropy/anisotropy: polished section very strong anisotropic, slightly higher than for nickeline, bluish green, bluish gray, violet-red
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section strong, more distinct than for nickeline, w light pinkish, ε bright pinkish violet
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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