Formula: NaAl(SO4)2.6H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.484, β = 1.486, γ = 1.497
Bireflectance/Birefringence δ: 0.013
2V angle: 48° (calculated), 60° (measured)
Dispersion: Strong, r > v or r < v
Optical orientation: Y = b, X Ù c = 4-5°
Optical axial plane:
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