| Reference Type | Journal (article/letter/editorial) |
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| Title | Znucalite, the only known zinc uranyl carbonate: Its crystal structure and environmental implications |
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| Journal | American Mineralogist |
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| Authors | Steciuk, Gwladys | Author |
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| Majzlan, Juraj | Author |
| Rohlíček, Jan | Author |
| Škoda, Radek | Author |
| Sejkora, Jiří | Author |
| Plášil, Jakub | Author |
| Year | 2024 (May) | Volume | < 109 > |
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| Page(s) | 949-959 | Issue | < 5 > |
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| URL | |
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| DOI | doi:10.2138/am-2023-8956Search in ResearchGate |
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| Original Entry | Steciuk, G., Majzlan, J., Rohlíček, J., Škoda, R., Sejkora, J., Plášil, J. (2023): Znucalite, the only known zinc uranyl carbonate: its crystal structure and environmental implications. American Mineralogist, 108, (in press). |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 16641534 | Long-form Identifier | mindat:1:5:16641534:6 |
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| GUID | c98ebd3f-ba57-4f8e-94ce-5becb4149e09 |
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| Full Reference | Steciuk, Gwladys, Majzlan, Juraj, Rohlíček, Jan, Škoda, Radek, Sejkora, Jiří, Plášil, Jakub (2024) Znucalite, the only known zinc uranyl carbonate: Its crystal structure and environmental implications. American Mineralogist, 109 (5) 949-959 doi:10.2138/am-2023-8956 |
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| Plain Text | Steciuk, Gwladys, Majzlan, Juraj, Rohlíček, Jan, Škoda, Radek, Sejkora, Jiří, Plášil, Jakub (2024) Znucalite, the only known zinc uranyl carbonate: Its crystal structure and environmental implications. American Mineralogist, 109 (5) 949-959 doi:10.2138/am-2023-8956 |
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| In | Link this record to the correct parent record (if possible) |
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| Abstract/Notes | Znucalite is a zinc uranyl-carbonate mineral that was until recently only partially characterized with a formula originally given as Zn12Ca(UO2)(CO3)3(OH)22·4H2O, with an unknown crystal structure and ambiguous symmetry determinations. We have reinvestigated this mineral using three-dimensional electron diffraction (3D ED) and powder X-ray diffraction and revealed for the first time its structural details. Znucalite is unambiguously monoclinic, P21/m, with a = 10.722(2) Å, b = 6.259(1) Å, c = 25.355(1) Å, β = 101.13(1)°, and V = 1669.54(9) Å3. The structure refinement of the 3D ED data using the dynamical approach (Robs = 0.1594 for 3579 observed reflections and 244 parameters) provided the following structure model. Znucalite possesses a layered structure, with a [Zn10(OH)14(CO3)2] double sheet (with Zn2+ both in octahedra and tetrahedra), which is connected to a thick interlayer that hosts U 6+, Ca2+, and H2O molecules. The linkage between structural units and the interlayer occurs via the vertices of ZnO4 tetrahedra protruding from the sheet. In the interlayer, differences in ordering between U and Ca take place and likely cause the difficulties encountered during the attempts to solve the structure. The refined structural formula of znucalite, Zn10Ca0.828[UO2]0.828[CO3]4(OH)15.312(H2O)5.484, corresponds well to the composition obtained from the electron-microprobe analyses, (Zn9.84Al0.16)Σ10.00 Ca0.83(UO2)0.80[(CO3)3.96(SO4)0.04]Σ4.00(OH)15.42(H2O)5.48. Raman spectroscopy evidenced the presence of several non-equivalent CO3 groups, as well as OH and H2O. The U-O bond lengths obtained from the stretching frequencies of UO22+ vibrations are in line with the structural model. A discussion on the environmental importance of znucalite is appended, based on geochemical calculations with an estimate of the solubility product for this mineral. |
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