Formula: (Fe,Ni,Co)As
Reflected/transmitted colour:
Pleochroism: RL distinct
Optical isotropy/anisotropy: RL distinct in air, orange borwn and bluish in oil
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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