Formula: Sb2S2O
Reflected/transmitted colour: polished section gray
Pleochroism:
Optical isotropy/anisotropy: biaxial, polished section strong to extreme anisotropy, violet to blue-green (in oil masked by internal reflections)
Optical sign: +
Refractive indices: α ≥ 2.72, β ≥ 2.72, γ ≥ 2.72
Birefringence δ/bireflectance: polished section distinct, gray to brownish or greenish gray
2V angle:
Dispersion:
Optical orientation: γ = y = elongation
Optical axial plane:
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