Wheatleyite

IMA formula: Na₂Cu(C₂O₄)₂·2H₂O

Crystallography: Triclinic. P-1. a = 7.559(3) Å, b = 9.665(4) Å, c = 3.589(1) Å, α = 76.65(2)°, β = 103.67(2)°, γ = 109.10(2)°. Z = 1.