Lindackerite

IMA formula: CuCu₄(AsO₄)₂(HAsO₄)₂·9H₂O

Crystallography: Triclinic. P-1. a = 6.440(2) Å, b = 8.065(3) Å, c = 10.411(5) Å, α = 85.44(4)°, β = 79.38(3)°, γ = 84.65(3)°. Z = 1.