Formula: (Zn,Fe,Mn)Al2(SO4)4 . 22H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.475, β = 1.48, γ = 1.488
Bireflectance/Birefringence δ: 0.013
2V angle: 78° (calculated), 70° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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