Formula: Sb
Reflected/transmitted colour: opaque, polished section white
Pleochroism: polished section very feeble
Optical isotropy/anisotropy: polished section distinct anisotropic, yellowish gray, brownish, bluish gray, sometimes only slight variations
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section weak, weaker than for bismuth and arsenic, about as for dyscrasite
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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