A new spin-/ frustrated antiferromagnet, CuO(VO)Cl, was synthesized via chemical vapor transport method that emulates mineral formation in volcanic fumaroles. CuO(VO)Cl is the first copper oxychloride vanadate obtained in the ternary CuO-VO-CuCl anhydrous system. Copper ions constitute a three-dimensional complex framework with a topological structure novel for synthetic compounds but similar to that in the fumarolic mineral yaroshevskite. All of the oxygen atoms except for the O7 site are strongly bonded in the VO tetrahedra. The O7 site belongs to an additional oxygen atom (O) being tetrahedrally coordinated by four Cu atoms, thus forming the OCu tetrahedra. The structural formula can be represented as Cu[CuO](VO)Cl highlighting oxocentered units in the structure. IR spectra reveal several absorption bands at 526, 578, and 601 cm interpreted as a characteristic feature of the OCu tetrahedra. CuO(VO)Cl reveals ferrimagnetic behavior with the Curie temperature = 24 K and the uncompensated moment of ∼ 1.9 μ/f.u.
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