Formula: Sb2S3
Reflected/transmitted colour: in polished section white with bluish tint (lighter than stibnite) with intense deep-red internal reflections
Pleochroism:
Optical isotropy/anisotropy: distinct in air, masked by internal reflections in oil
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: -
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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