Formula: Al11(PO4)9(OH)6.38H2O
Reflected/transmitted colour: Colourless
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.470, β = 1.477, γ = 1.482
Bireflectance/Birefringence δ: 0.012
2V angle: 67-74° (measured)
Dispersion:
Optical orientation: X = c, Y = b, Z = a
Optical axial plane:
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