Formula: Cu5(SeO3)2O2Cl2
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 2.06, β = 2.11, γ = 2.15
Bireflectance/Birefringence δ: 0.09
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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