Formula: Pb(U+4,U+6)(Ti,Fe+2,Fe+3)20(O,OH)38
Reflected/transmitted colour: Light gray to white (RL)
Pleochroism:
Optical isotropy/anisotropy: Isotropic
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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