Formula: As8S9
Reflected/transmitted colour: polished section light gray, with rose-yellow internal reflections, orange yellow in transmitted light
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: α = 2.39, γ = 2.52
Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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