Formula: Na2ZrSi4O11
Reflected/transmitted colour: Colourless
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.607, β = 1.623, γ = 1.628
Bireflectance/Birefringence δ: 0.021
2V angle: 40-56° (measured)
Dispersion: Distinct, r > v
Optical orientation:
Optical axial plane:
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