Clinochalcomenite

IMA formula: CuSeO₃(H₂O)₂

Crystallography: Monoclinic. P2₁/n. a = 6.2736(3) Å, b = 8.5930(4) Å, c = 8.1633(4) Å, β = 97.267(2)°. Z = 4.