Formula: Cu10(AsO4)4SO4(OH)6·8H2O
Reflected/transmitted colour:
Pleochroism: Blue-green (x), pale green (y, z)
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.590, β = 1.740, γ =1.744
Bireflectance/Birefringence δ: 0.154
2V angle: 17.3 (calculated), 18° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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