Formula: Pb3O4
Reflected/transmitted colour: red to colourless, polished section pinkish yellow gray, influenced by strong internal reflections, normal colour is bluish
Pleochroism: strong, nearly colourless and deep reddish brown
Optical isotropy/anisotropy: uniaxial, polished section obscured by internal reflections
Optical sign:
Refractive indices: n = 2.422
Birefringence δ/bireflectance: weak with anomalous green interference colours, polished section weak, yellow gray or orange-gray to gray-bluish
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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