Formula: (K2,Ca)(UO2)7(PO4)4(OH)6.6H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.669, β = 1.692, γ = 1.710
Bireflectance/Birefringence δ: 0.041
2V angle: 80° (calculated), 83° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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