Formula: Pb(Cu,Zn)2(AsO4)2.2H2O
Reflected/transmitted colour: Pale gray
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.85, β = 1.87, γ = 1.92
Bireflectance/Birefringence δ: 0.07
2V angle: 68° (calculated), 70° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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