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Type: Journal article
Title: Crystal structure of pseudojohannite, with a revised formula, Cu₃(OH)₂[(UO₂)₄O₄SO₄)₂](H₂O)₁₂
Other Titles: Crystal structure of pseudojohannite, with a revised formula, Cu(3)(OH)(2)[(UO(2))(4)O(4)SO(4))(2)](H(2)O)(12)
Author: Plášil, J.
Fejfarová, K.
Wallwork, K.
Dušek, M.
Škoda, R.
Sejkora, J.
Čejka, J.
Veselovský, F.
Hloušek, J.
Meisser, N.
Brugger, J.
Citation: American Mineralogist: an international journal of earth and planetary materials, 2012; 97(10):1796-1803
Publisher: Mineralogical Society of America
Issue Date: 2012
ISSN: 0003-004X
Statement of
J. Plášil, K. Fejfarová, K.S. Wallwork, M. Dušek, R. Škoda, J. Sejkora, J. Čejka, F. Veselovský, J. Hloušek, N. Meisser, J. Brugger
Abstract: 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 Robs = 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) ų, with Z = 1 and chemical 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 zippeites 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.
Keywords: Pseudojohannite; zippeite group; uranyl sulfate; X‑ray diffraction; crystal structure; chemical composition
Rights: © 2012 Mineralogical Society of America
DOI: 10.2138/am.2012.4127
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Appears in Collections:Aurora harvest 3
Geology & Geophysics publications

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