Formula: BaNa(Na,Ti)4(Ti,Nb)2Si4O14(OH,O)3(OH,F)2·3H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.668, β = 1.679, γ = 1.710
Bireflectance/Birefringence δ: 0.042
2V angle: 63° (calculated), 63° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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