Formula: Cu3AsS4
Reflected/transmitted colour: opaque, polished section pinkish gray or light pinkish brown (in air), in oil much darker, more violet-gray or brownish gray in darkest position
Pleochroism:
Optical isotropy/anisotropy: polished section strong anisotropic, polarisation colours in bluish, greenish, reddish and orange tints
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section distinct (in oil) //α grayish pink, //b pinkish gray, //γ grayish violet
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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