Formula: NaCaAlF6.H2O
Reflected/transmitted colour: Colourless
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.4072, β = 1.4136, γ = 1.415
Bireflectance/Birefringence δ: 0.078
2V angle: 50-55° (measured)
Dispersion: Weak, r < v
Optical orientation: X ⋀ c = -52°, Z = b
Optical axial plane:
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