Formula: Tl4Hg3Sb2As8S20
Reflected/transmitted colour: polished section grayish white with bluish tint with red internal reflections
Pleochroism:
Optical isotropy/anisotropy: biaxial, polished section distinct anisotropic, not as strong as for lorandite, blue or bluish green to reddish yellow
Optical sign: +
Refractive indices: n ≥ 2.72
Birefringence δ/bireflectance:
2V angle:
Dispersion: r > v
Optical orientation:
Optical axial plane:
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