Formula: PbCuBiS3
Reflected/transmitted colour: polished section cream-white, in oil more pinkish
Pleochroism: cream-white to pure white or light brown
Optical isotropy/anisotropy: distinct in air, strong in oil, blue-gray-white, pinkish gray-white and a characteristic white, sharp and complete extinction, except in some orientations where slight dispersion of extinction is indicated by a deep indigo-blue colour
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ: distinct in air, very distinct in oil: //c creamy white, ┴ c white or light brown
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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