Formula: (Co,Ni)As2-3
Reflected/transmitted colour: opaque, polished section colour depends on composition, zones with a creamy white colour may alternate with more grayish white or even bluish white zones
Pleochroism:
Optical isotropy/anisotropy: polished section isotropic, sometimes weakly anomalous anisotropy visible in markedly zoned crystals
Optical sign:
Refractive indices:
Birefringence δ/bireflectance:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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