Formula: (K,Ba)2(Ti,Fe)6O13
Reflected/transmitted colour: Gray, may have golden internal reflections (RL)
Pleochroism: Capri blue (x), dark greenish brown (y), dark olive buff (z)
Optical isotropy/anisotropy: Biaxial (TL), weak (RL)
Optical sign: ?
Refractive indices: α = 2.13, β = 2.21, γ = 2.35
Bireflectance/Birefringence δ: 0.22
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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