Schreibersite

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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