Formula: Bi2S3
Reflected/transmitted colour: opaque, polished section white (in air), in oil white with a bluish gray tint
Pleochroism:
Optical isotropy/anisotropy: polished section very strong, especially in oil, but weaker than for stibnite, slate-gray to yellowish brown or gray-violet. straight extinction. Large crystals commonly show undulatory extinction
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section weak to distinct, much weaker than for stibnite, γ creamy white, α bluish gray-white, β gray-white
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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