Formula: KCu3(SO4)2OCl
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.695, β = 1.718, γ = 1.759
Bireflectance/Birefringence δ: 0.064
2V angle: 76° (calculated), 75° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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