Formula: (U,Y)(Ti,Nb)2O6
Reflected/transmitted colour: Pale gray with bluish tint and dark red-brown internal reflections
Pleochroism:
Optical isotropy/anisotropy:
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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