Formula: Al4(PO4)3(OH)3.9H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.511, β = 1.56, γ = 1.578
Bireflectance/Birefringence δ: 0.067
2V angle: 60° (calculated), 61° (measured)
Dispersion:
Optical orientation: X = c, Y = b, Z = a
Optical axial plane:
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