Formula: PbMnO2(OH)
Reflected/transmitted colour: Deep brown
Pleochroism:
Optical isotropy/anisotropy: Biaxial, RL strong
Optical sign: + (?)
Refractive indices: n ≈ 2.30
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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