Formula: Na2CaZrSi2O7F2
Reflected/transmitted colour: colourless
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: -
Refractive indices: α = 1.627, β = 1.634, γ = 1.639
Bireflectance/Birefringence δ: 0.012
2V angle: calculated 80°
Dispersion: r < v, weak
Optical orientation: α = b, β = c, γ = a
Optical axial plane:
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