Formula: 4Al2O3.H2O
Reflected/transmitted colour: pale greenish yellow to colourless
Pleochroism:
Optical isotropy/anisotropy: uniaxial
Optical sign: -
Refractive indices: ω = 1.747, ε = 1.741
Birefringence δ: 0006
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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