Formula: (Ce,La)(Y,U,Fe)(Ti,Fe)20(O,OH)38
Reflected/transmitted colour: opaque to translucent in very thin fragments, clove-brown, to brown or reddish brown. Deep-brown internal reflections are rare.
Pleochroism:
Optical isotropy/anisotropy: isotropic when metamict, polished section isotropic when metamict, sometimes weakly anisotropic
Optical sign:
Refractive indices:
Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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