Formula: Pb2SnCu
Reflected/transmitted colour: pink with slight lilac tinge
Pleochroism: detectable
Optical isotropy/anisotropy: strong, in grayish brown to golden colours
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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