Formula: As
Reflected/transmitted colour: opaque, polished section white, tarnishes in air in one day, more quickly than stibarsen
Pleochroism: feeble
Optical isotropy/anisotropy: polished section very distinct anisotropic, strong than for antimony or stibarsen, steel-gray, yellow-gray or dark gray tints
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section in oil distinct, grayish white with a yellow tint (w), or light bluish gray (ε)
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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