Formula: HNa2LiAl(PO4)2(OH)
Reflected/transmitted colour: Colourless
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.541, β = 1.563, γ = 1.564
Bireflectance/Birefringence δ: 0.023
2V angle: 24° (calculated), 23° (measured)
Dispersion: Weak, r < v
Optical orientation: X = c, Y = b, Z = a
Optical axial plane:
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