Formula: FeAs2
Reflected/transmitted colour: opaque, polished section white, often with a yellowish tint
Pleochroism:
Optical isotropy/anisotropy: polished section very strong anisotropic, bright orange-yellow, reddish brown, pale brown, blue, pale slaty blue, green
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section weak but distinct in oil, white or bluish, white to yellowish white, weaker than for arsenopyrite, but stronger than for safflorite
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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