Formula: (Cu,Fe)(Sn,Sb)
Reflected/transmitted colour: White with occasional pinkish tint at high magnifications
Pleochroism:
Optical isotropy/anisotropy: Distinct to moderate, from brownish gray to bluish gray.
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ: Not observed in air, weakly to distinctly in oil
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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