Formula: HgS
Reflected/transmitted colour: polished section in air white with a bluish gray tint, in oil bluish gray with intense and abundant bright red internal reflections
Pleochroism:
Optical isotropy/anisotropy: uniaxial, polished section distinct anisotropic, commonly masked by internal reflections
Optical sign: +
Refractive indices: w = 2.905, ε = 3.256
Birefringence δ/bireflectance: ~ 0.35, polished section distinct in oil
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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