Formula: HgSb4S8
Reflected/transmitted colour: red in thin splinters, otherwise opaque, polished section light to blackish gray with a creamy tint, internal reflections occurs in places as blood-red, but not as abundant as in proustite or cinnabar
Pleochroism: weak
Optical isotropy/anisotropy: biaxial, polished section strong anisotropic, dark violet to light green-gray (nicols not completely crossed)
Optical sign: -
Refractive indices: n ≥ 2.72
Birefringence δ/bireflectance: polished section distinct creamy gray to creamy brown with a violet tint
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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