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The crystal structure of pseudojohannite from White Canyon, Utah, was solved by charge-flipping from single-crystal X-ray diffraction data and refined to an R obs  = 0.0347, based on 2664 observed reflections. Pseudojohannite from White Canyon is triclinic, P1̄, with a = 8.6744(4), b = 8.8692(4), c = 10.0090(5) Å, α = 72.105(4)°, β = 70.544(4)°, γ = 76.035(4)°, and V = 682.61(5) Å 3 , with Z = 1 and chemical formula Cu 3 (OH) 2 [(UO 2 ) 4 O 4 (SO 4 ) 2 ](H 2 O) 12 . The crystal structure of pseudojohannite is built up from sheets of zippeite topology that do not contain any OH groups; these sheets are identical to those found in zippeites containing Mg 2+ , Co 2+ , and Zn 2+ . The two Cu 2+  sites in pseudojohannite are [5]- and [6]-coordinated by H 2 O molecules and OH groups. The crystal structure of the pseudojohannite holotype specimen from Jáchymov was refined using Rietveld refinement of high-resolution powder diffraction data. Results indicate that the crystal structures of pseudojohannite from White Canyon and Jáchymov are identical.

Crystal structure of pseudojohannite, with a revised formula, Cu 3 (OH) 2 [(UO 2 ) 4 O 4 (SO 4 ) 2 ](H 2 O) 12