Formula: (K,Na)2(UO2)2Si5O13.4H2O
Reflected/transmitted colour:
Pleochroism: Colourless (x), pale yellow green (y), yellow green (z)
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.596, β = 1.603, γ = 1.606
Bireflectance/Birefringence δ: 0.010
2V angle: 66° (calculated), 60° (measured)
Dispersion: Strong, r > v
Optical orientation:
Optical axial plane:
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