Formula: Pb3Fe4Mn3O15
Reflected/transmitted colour: RL bright white
Pleochroism:
Optical isotropy/anisotropy: Uniaxial, RL distinct in shades of gray and pale brown
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ: Weak, visible only in oil
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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