Formula: (Co,Fe)As2
Reflected/transmitted colour: opaque, polished section white, often with a bluish tint
Pleochroism:
Optical isotropy/anisotropy: polished section strong anisotropic, in zonal textures differing for different zones, higher than for glaucodot
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section very weak, less distinct than for löllingite, bluish to grayish, more distinct at higher Fe-contents
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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