Allabogdanite

Formula: (Fe,Ni)2P

Reflected/transmitted colour: creamy in reflected light

Pleochroism:

Optical isotropy/anisotropy: anisotropic, Distinct, light to dark creamy

Optical sign:

Refractive indices:

Birefringence δ:

2V angle:

Dispersion:

Optical orientation:

Optical axial plane:

 

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