Formula: ZnFe4(SO4)6(OH)2 .18H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.534, β = 1.554, γ = 1.586
Bireflectance/Birefringence δ: 0.052
2V angle: 80° (calculated), 78° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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