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The structure of vandendriesscheite, Z = 8, Pb 1.57 [(UO 2 ) 10 O 6 (OH) 11 ](H 2 O) 11 , orthorhombic, a = 14.1165(6), b = 41.378(2), c = 14.5347(6) Å , V = 8490 Å 3 , space group Pbca, has been solved by direct methods and refined by full-matrix least-squares techniques to an agreement factor (R) of 12.1% and a goodness-of-fit (S) of 1.28 using 4918 unique observed reflections (|F₀| ≥ 4σF) collected with MoKα X-radiation and a CCD (chargecoupled device) detector. The structure contains ten unique U 6+  positions, each of which is part of a nearly linear (UO 2 ) 2+  uranyl ion that is further coordinated by five equatorial (O 2- ,OH - ) anions to form pentagonal bipyramidal polyhedra. There are two unique Pb positions; one is fully occupied, but site-scattering refinement gives an occupancy factor of 0.573(8) for the other. The Pb positions are coordinated by O atoms of the uranyl ions and by H 2 O groups. There are 11 unique H 2 O groups; five are bonded to Pb and the other six are held in the structure by hydrogen bonds only. The U polyhedra link by the sharing of equatorial edges to form sheets parallel to (001). The sheet of U polyhedra is not known from another structure and is the most complex yet observed in a uranyl oxide hydrate. The sheets are structurally intermediate to those in schoepite and becquerelite and are linked by bonds to the interlayer Pb cations and the H 2 O groups. The extensive network of hydrogen bonds that link adjacent sheets is derived on the basis of crystal-chemical constraints.

A new uranyl oxide hydrate sheet in vandendriesscheite: Implications for mineral paragenesis and the corrosion of spent nuclear fuel