Formula: PbO2
Reflected/transmitted colour: mostly opaque, polished section gray with abundant reddish brown internal reflections
Pleochroism: distinct
Optical isotropy/anisotropy: uniaxial, polished section distinct anisotropic in crystalline material, blue to grayish
Optical sign:
Refractive indices: n = 2.30
Birefringence δ/bireflectance: polished section weak, but distinct on grain boundaries, gray to gray with a bluish tint
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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