Formula: Pb(Co,Ni,Zn)2(AsO4)2·2H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.85, β = 1.87, γ = 1.90
Bireflectance/Birefringence δ: 0.05
2V angle: 80° (calculated), 85° (measured)
Dispersion: Distinct, r > v
Optical orientation:
Optical axial plane:
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