Formula: (Fe,Al)(UO2)4(PO4)2(SO4)2(OH).22H2O(Fe,Al)(UO2)4(PO4)2(SO4)2(OH).22H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: -
Refractive indices: α = 1.558, β = 1.576, γ = 1.593
Bireflectance/Birefringence δ: 0.035
2V angle: m: 87° , calculated: 86°
Dispersion:
Optical orientation:
Optical axial plane:
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