Formula: Fe2(SO4)3.10H2O
Reflected/transmitted colour: Colourless to pale rose
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.547, β = 1.566, γ = 1.594
Bireflectance/Birefringence δ: 0.047
2V angle: 70° (measured)
Dispersion: Strong, horizontal, r < v
Optical orientation:
Optical axial plane:
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