Formula: (Nd,Ce,Ca)(Ti,Nd)2(O,OH)6
Reflected/transmitted colour: dark gray
Pleochroism: weak to distinct
Optical isotropy/anisotropy: isotropic when metamict to biaxial
Optical sign:
Refractive indices: n = 2.1 -2.4 (metamict)
Birefringence δ:
2V angle: 78-82°
Dispersion: weak to strong
Optical orientation:
Optical axial plane:
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