Formula: (Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6
Reflected/transmitted colour: reddish brown to light brown
Pleochroism:
Optical isotropy/anisotropy: isotropic when metamict, otherwise biaxial
Optical sign:
Refractive indices: n = 2.26
Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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