Allargentum

Formula: Ag1-xSbx ( x = 0.09 to 0.16)

Reflected/transmitted colour: opaque, polished section white with a slight gray tint

Pleochroism:

Optical isotropy/anisotropy: polished section weak to distinct

Optical sign:

Refractive indices:

Birefringence δ/bireflectance: polished section, not present

2V angle:

Dispersion:

Optical orientation:

Optical axial plane:

 

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