Formula: (Fe,Ni)3P
Reflected/transmitted colour: opaque, polished section white (in air), with a brownish pink tint (in oil)
Pleochroism:
Optical isotropy/anisotropy: uniaxial, polished section weak but distinct anisotropic in oil
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section in oil distinct, pinkish brown to yellowish
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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