Pseudomalachite

IMA formula: Cu₅(PO₄)₂(OH)₄

Crystallography: Monoclinic. P2₁/c. a = 4.4728(4) Å, b = 5.7469(5) Å, с = 17.032(3) Å, and β = 91.043(7)°. Z = 2.