Formula: Cs4Na2Zr3[Si18O45](H2O)2
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.585, β = 1.598, γ = 1.603
Bireflectance/Birefringence δ: 0.018
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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