Formula: Au4Cu(Te,Pb)
Reflected/transmitted colour: opaque, polished section bright orange-yellow, resembling gold but having lower reflectivity
Pleochroism:
Optical isotropy/anisotropy: weak, in neutral gray shades
Optical sign:
Refractive indices:
Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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