Formula: PbO
Reflected/transmitted colour: red to red-orange, polished section gray-white with numerous purpur-red internal reflections
Pleochroism:
Optical isotropy/anisotropy: uniaxial, polished section strongly obscured by internal reflections
Optical sign: -
Refractive indices: w = 2.665, ε = 2.535
Birefringence δ/bireflectance: 0.13, polished section not discernable
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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