Formula: (K,Ba)NaCa2(Si,Ti)4O11(F,OH).H2O
Reflected/transmitted colour:
Pleochroism: Pale rose yellow (x), rose yellow (y), rose yellow (z)
Optical isotropy/anisotropy: Biaxial
Optical sign: ?
Refractive indices: α = 1.644, γ = 1.66
Bireflectance/Birefringence δ:
2V angle: 46-76° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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