Formula: AsSbS3
Reflected/transmitted colour: polished section grayish white with a slight blue tint
Pleochroism:
Optical isotropy/anisotropy: biaxial, polished section weak anisotropy obscured by internal reflections
Optical sign: +
Refractive indices: α ≥ 2.72, ?
Birefringence δ/bireflectance: polished section distinct (in oil only)
2V angle: <46°
Dispersion: r > v, strong, crossed
Optical orientation: α = y, β Λ x = 15-16°, β Λ z = 101-102°
Optical axial plane:
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