Formula: Al2(SO4)(OH)4.7H2O
Reflected/transmitted colour: colourless
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: α = 1.459, β = 1.464, γ = 1.470
Birefringence δ: 0.011
2V angle: measured: 90°, calculated: 86°
Dispersion:
Optical orientation: α = elongation
Optical axial plane:
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