Formula: K2,Ca,Sr)U3O10.4H2O
Reflected/transmitted colour: orange
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: -
Refractive indices: α = nd, β = 2.01, γ = 2.06
Birefringence δ: nd but > 0.05
2V angle: 55°
Dispersion:
Optical orientation: α = a, γ = b
Optical axial plane:
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