Formula: LiFe(PO4)(OH)
Reflected/transmitted colour:
Pleochroism: Yellow-green (X=Y), colourless (Z)
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.795, β = 1.810, γ = 1.835
Bireflectance/Birefringence δ: 0.040
2V angle: 78° (calculated), 74° (measured)
Dispersion: Strong, r > v
Optical orientation: X Ù a ≈ 15°, Y Ù b ≈ 0°, z Ù c ≈ 38°
Optical axial plane:
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