Formula: γ-AlO(OH)
Reflected/transmitted colour: colourless
Pleochroism: -
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: α = 1.64-1.65, β = 1.65-1.66, γ = 1.66-1.67
Birefringence δ: 0.015-0.020
2Vγ angle: 74-88°
Dispersion: -
Optical orientation: α = y or z, β = z or y, γ = x
Optical axial plane: (001) or (010)
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