Formula: (Ca,Na,Fe,Ce,Sr)(Ti,Nb)O3
Reflected/transmitted colour: dark brown to colourless
Pleochroism: weak, with absorption γ > α
Optical isotropy/anisotropy: biaxial (pseudo isotropic)
Optical sign: +
Refractive indices: n = 2.26-2.40
Birefringence δ: weak
2Vγ angle: ~ 90°
Dispersion: r > v (over γ)
Optical orientation:
Optical axial plane:
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