| Reference Type | Journal (article/letter/editorial) |
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| Title | Crystal structure of the (REE)-uranyl carbonate mineral kamotoite-(Y) |
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| Journal | Mineralogical Magazine |
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| Authors | Plášil, Jakub | Author |
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| Petříček, Václav | Author |
| Year | 2017 (June) | Volume | 81 |
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| Issue | 3 |
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| Publisher | Mineralogical Society |
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| DOI | doi:10.1180/minmag.2016.080.123Search in ResearchGate |
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| Generate Citation Formats |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 244903 | Long-form Identifier | mindat:1:5:244903:0 |
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| GUID | 0 |
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| Full Reference | Plášil, Jakub, Petříček, Václav (2017) Crystal structure of the (REE)-uranyl carbonate mineral kamotoite-(Y) Mineralogical Magazine, 81 (3) 653-660 doi:10.1180/minmag.2016.080.123 |
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| Plain Text | Plášil, Jakub, Petříček, Václav (2017) Crystal structure of the (REE)-uranyl carbonate mineral kamotoite-(Y) Mineralogical Magazine, 81 (3) 653-660 doi:10.1180/minmag.2016.080.123 |
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| In | (2017, June) Mineralogical Magazine Vol. 81 (3) Mineralogical Society |
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| Abstract/Notes | Kamotoite-(Y) is a rare supergene product of uraninite hydration–oxidation weathering and its structure is unknown. Based on single-crystal X-ray diffraction data collected with high-redundancy using a microfocus source, kamotoite-(Y) is monoclinic, has space group P21/n,with a = 12.3525(5), b = 12.9432(5), c = 19.4409(7) Å, β = 99.857(3)°, V = 3069.8(2) Å3 and Z = 4. Crystals are pervasively twinned (two-fold rotation around [0.75 0 0.75]), giving a strongly pseudo-orthorhombic diffraction pattern. The pseudoorthorhombic pattern can be described with an orthorhombic super-cell (transformation matrix 0,1,0/1,0,1/3,0,1), approximately four times larger in volume then a true monoclinic unit cell. This unit-cell is the same as the cell given elsewhere for the structure of bijvoetite-(Y),another (REE)-containing uranyl carbonate. The successful structure solution and refinement (R = 0.044 for 6294 unique observed reflections), carried out using our choice of unit cell, as well as the superstructure refinement and comparison of the original structure data forbijvoetite-(Y) reveal that these two crystal structures are identical. The crystal structure of kamotoite-(Y) consists of electroneutral sheets of the bijvoetite-(Y) uranylanion topology and an interlayer with H2O molecules not-coordinated directly to any metal cation. Despite determinationof the kamotoite-(Y) structure and demonstration that bijvoetite-(Y) has the same structure, the identity of these two minerals cannot be proved without additional study of the holotype material. |
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