Formula: KAl(SO4)2 . 11H2O
Reflected/transmitted colour: Colourless
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.430, β = 1.452, γ = 1.485
Bireflectance/Birefringence δ: 0.055
2V angle: 82° (calculated), 52° (measured)
Dispersion: None
Optical orientation:
Optical axial plane:
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