Formula: Al(OH)3
Reflected/transmitted colour: colourless to pale brown
Pleochroism: -
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: α = 1.56-1.58, β = 1.56-1.58, γ = 1.58-1.60
Birefringence δ: ~ 0.02
2Vγ angle: 0-40°
Dispersion: r > v, strong
Optical orientation: α = y, β Λ x = 25°, γ Λ z = ~ 21°
Optical axial plane: ┴ (010)
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