Bellidoite

Formula: Cu2Se

Reflected/transmitted colour: opaque, polished section creamy white

Pleochroism: very weak

Optical isotropy/anisotropy: very weak, in gray colours

Optical sign:

Refractive indices:

Birefringence δ:

2V angle:

Dispersion:

Optical orientation:

Optical axial plane:

 

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