Formula: (Fe,Mg)Fe(UO2,PO4)4.12-13H2O
Reflected/transmitted colour:
Pleochroism: Very weak
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: a=1.575, b=1.589, g=1.603
Bireflectance/Birefringence δ: 0.028
2V angle: 88 (calculated), 89 (measured)
Dispersion:
Optical orientation: X = b, Z Ù c = small
Optical axial plane:
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