Formula: (Fe,Ni,Co)3C
Reflected/transmitted colour: opaque, polished section creamy white
Pleochroism:
Optical isotropy/anisotropy: biaxial, polished section weak anisotropic, but distinct
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section weak but distinct bireflectance
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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