Formula: Sb2S3
Reflected/transmitted colour: opaque, polished section white to grayish white
Pleochroism:
Optical isotropy/anisotropy: polished section very strong anisotropy, 45° blue, gray-white, brown, pinkish brown, straight extinction, undulous extinction very common
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section //α dull gray white, //β brownish gray, //γ pure white
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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