Formula: As
Reflected/transmitted colour: opaque, polished section very similar to arsenic
Pleochroism:
Optical isotropy/anisotropy: polished section weak anisotropy in air, strong in oil
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section distinct in air, stronger in oil, //(001) similar to arsenic, ┴ (001) darker
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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