Formula: Pb3CuCl2(OH)2O2
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 2.16, β = 2.24, γ = 2.25
Bireflectance/Birefringence δ: 0.09
2V angle: 36° (calculated), 70° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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