Formula: Ba9Fe2Ti2(SiO3)12(OH,Cl,F)6.6H2O
Reflected/transmitted colour:
Pleochroism: Brownish red (O), colourless or straw-yellow (E)
Optical isotropy/anisotropy: Uniaxial
Optical sign: -
Refractive indices: ε = 1.702, ω = 1.714
Bireflectance/Birefringence δ: 0.012
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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