Formula: (U,Ca,Ce)2(Nb,Ta)2O6(OH,F)
Reflected/transmitted colour: Deeo red-brown
Pleochroism:
Optical isotropy/anisotropy: Isotropic
Optical sign:
Refractive indices: n = 1.89-1.98
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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