Formula: AuTe2
Reflected/transmitted colour: white with creamy or yellowish tint
Pleochroism: weak
Optical isotropy/anisotropy: weak to distinct (weaker than for sylvanite and krennerite), greyish red, green, greenish brown ( or light gray to dark gray with brownish tints). Sharp oblique extinction
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ: weak to distinct (depends on orientation, but more distinct than for krennerite)
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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