Formula: Na2Cu(C2O4)2.2H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.4, β = 1.499, γ = 1.667
Bireflectance/Birefringence δ: 0.267
2V angle: 84° (calculated), 83° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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