Formula: HgS
Reflected/transmitted colour: opaque, polished section in air grayish white, in oil much darker with a brownish gray tint
Pleochroism: occasionally weak
Optical isotropy/anisotropy: polished section isotropic, often shows anomalous anisotropy, then a very weak bireflectance may be visible at grain boundaries
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section usually not present
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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