Formula: Pb2Bi2S5
Reflected/transmitted colour: white, with only a trace of cream
Pleochroism: weak
Optical isotropy/anisotropy: weak anisotropy in air, distinct in oil, pinkish yellow, bluish or violet-gray. Se-cosalite more strongly anisotropic
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ: weak in air, more distinct in oil; parallel elongation creamy, lighter, perpendicular elongation darker, greenish
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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