Langisite

Formula: (Co,Ni)As

Reflected/transmitted colour: opaque, polished section pinkish buff

Pleochroism:

Optical isotropy/anisotropy: polished section moderate anisotropic, bluish gray to light brown

Optical sign:

Refractive indices:

Birefringence δ/bireflectance: polished section very weak

2V angle:

Dispersion:

Optical orientation:

Optical axial plane:

 

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