Formula: KNaZrSi3O9 . 2H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.578, β = 1.597, γ = 1.606
Bireflectance/Birefringence δ: 0.028
2V angle: 68° (calculated), 67° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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