Formula: Na2Zr(PO4)(CO3)(OH).2H2O
Reflected/transmitted colour: Colourless
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.569, β = 1.594, γ = 1.622
Bireflectance/Birefringence δ: 0.053
2V angle: 88° (calculated), 81° (measured)
Dispersion: Strong, r << v
Optical orientation: X = b, Z Ù c = 22°
Optical axial plane:
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