Formula: As4S5
Reflected/transmitted colour: Grayish white with bright yellow internal reflections (RL)
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 2.38, γ = 2.68
Bireflectance/Birefringence δ: 0.30
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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