Formula: PbTe
Reflected/transmitted colour: opaque, polished section white with a delicate greenish hue
Pleochroism:
Optical isotropy/anisotropy: weak to distinct; grayish 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): light yellow-white to light yellow-brown
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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