A phase formed in the CuO–P2O5–H2O system is an additional polymorph of pseudomalachite, Cu5(PO4)2(OH)4. This phase crystallizes in the space group P1 with a = 4.445(1), b = 5.873(1), c = 8.668(3)Å, α = 103.62(2), β = 90.35(2), γ = 93.02(1)°. The structure, solved by Patterson methods, was refined by full-matrix least-squares techniques to a residual R = 0.022 (Rw = 0.036). The four crystallographically unique copper atoms lie in characteristically distorted (four short and two long bonds) six-coordinated sites which link together to form two-dimensional copper-containing sheets. As in the other two polymorphs, these sheets (which are joined together by phosphate tetrahedra and hydrogen bonds) can be derived from a two-dimensional framework of edge-sharing, copper-containing polyhedra.

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First page of The crystal structure of a third polymorph of Cu<sub>5</sub>(PO<sub>4</sub>)<sub>2</sub>(OH)<sub>4</sub>
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