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

0384414 - FZÚ 2013 RIV US eng J - Journal Article
Plášil, Jakub - Fejfarová, Karla - Wallwork, K.S. - Dušek, Michal - Škoda, R. - Sejkora, J. - Čejka, J. - Veselovský, F. - Hloušek, J. - Meisser, N. - Brugger, J.
Crystal structure of pseudojohannite, with a revised formula, Cu₃(OH)₂[(UO₂)₄O₄(SO₄)₂](H₂O)₁₂.
American Mineralogist. Roč. 97, č. 10 (2012), s. 1796-1803. ISSN 0003-004X. E-ISSN 1945-3027
R&D Projects: GA ČR(CZ) GAP204/11/0809
Institutional research plan: CEZ:AV0Z10100521
Keywords : pseudojohannite * zippeite group * uranyl sulfate * X-ray diffraction * crystal structure * chemical composition
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 2.204, year: 2012

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 R1 = 3.47%, based on 2664 observed reflections. Pseudojohannite from White Canyon is triclinic, P1, 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) Å3, with Z=1 and formula Cu3(OH)2[(UO2)4O4(SO4)2](H2O)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 zi! ppeites containing Mg2+, Co2+, and Zn2+. The two Cu2+ sites in pseudojohannite are [5]- and [6]-coordinated by H2O 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.
Permanent Link: http://hdl.handle.net/11104/0214078