Formula: NaY(CO3)2·6H2O
Reflected/transmitted colour: colourless
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: α = 1.480, β = 1.498, γ = 1.571
Birefringence δ: 0.091
2V angle: measured 53°, calculated 55°
Dispersion:
Optical orientation: β = b, γ^a = 14°
Optical axial plane:
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