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Journal Article

Shinkolobweite, from the Shinkolobwe Mine, Democratic Republic of Congo: A New Mineral Containing Uranium in the Rare Pentavalent Oxidation State Available to Purchase

Travis A. Olds, Aaron J. Lussier, Václav PetŘíček, Jakub Plášil, Anthony R. Kampf, Allen G. Oliver, Peter C. Burns, Mateusz Dembowski, Ian M. Steele
Published: 29 September 2023
The Canadian Journal of Mineralogy and Petrology (2023) 61 (5): 999–1020.
DOI: https://doi.org/10.3749/2300003
...Travis A. Olds; Aaron J. Lussier; Václav PetŘíček; Jakub Plášil; Anthony R. Kampf; Allen G. Oliver; Peter C. Burns; Mateusz Dembowski; Ian M. Steele ABSTRACT Shinkolobweite, Pb 1.333 [U 5+ O(OH)(UO 2 ) 5 O 4.67 (OH) 5.33 ](H 2 O) 5 , is a new lead uranyl oxide-hydroxide hydrate mineral containing...
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View PDF for article title, <span class="search-highlight">Shinkolobweite</span>, from the Shinkolobwe Mine, Democratic Republic of Congo: A New Mineral Containing Uranium in the Rare Pentavalent Oxidation State
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STRUCTURAL AND COMPOSITIONAL DETAILS FOR SHINKOLOBWEITE AND RELATED MINERAL... Available to Purchase

Published: 29 September 2023
TABLE 1. STRUCTURAL AND COMPOSITIONAL DETAILS FOR SHINKOLOBWEITE AND RELATED MINERALS
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ELECTRON MICROPROBE DATA AND apfu CALCULATIONS FOR SHINKOLOBWEITE Available to Purchase

Published: 29 September 2023
TABLE 2. ELECTRON MICROPROBE DATA AND apfu CALCULATIONS FOR SHINKOLOBWEITE
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DATA COLLECTION AND STRUCTURE REFINEMENT DETAILS FOR SHINKOLOBWEITE Available to Purchase

Published: 29 September 2023
TABLE 3. DATA COLLECTION AND STRUCTURE REFINEMENT DETAILS FOR SHINKOLOBWEITE
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SELECTED INTERATOMIC DISTANCES (Å) IN THE COMMENSURATE STRUCTURE OF SHINKOL... Available to Purchase

Published: 29 September 2023
TABLE 5. SELECTED INTERATOMIC DISTANCES (Å) IN THE COMMENSURATE STRUCTURE OF SHINKOLOBWEITE
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The average shinkolobweite structure viewed along [010].

The average shinkolobweite structure viewed along [010]. Available to Purchase

Published: 29 September 2023
Fig. 6. The average shinkolobweite structure viewed along [010].
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ATOMIC COORDINATES AND DISPLACEMENT PARAMETERS (Å 2 ) FOR THE AVERAGE STRUC... Available to Purchase

Published: 29 September 2023
TABLE 4. ATOMIC COORDINATES AND DISPLACEMENT PARAMETERS (Å 2 ) FOR THE AVERAGE STRUCTURE OF SHINKOLOBWEITE
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DISTRIBUTION OF U 3 O 8 SHEET TOPOLOGIES IN SHINKOLOBWEITE Available to Purchase

Published: 29 September 2023
TABLE 7. DISTRIBUTION OF U 3 O 8 SHEET TOPOLOGIES IN SHINKOLOBWEITE
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The infrared (ATR) spectrum of shinkolobweite from 4000 to 650 cm−1.

The infrared (ATR) spectrum of shinkolobweite from 4000 to 650 cm −1 . Available to Purchase

Published: 29 September 2023
Fig. 3. The infrared (ATR) spectrum of shinkolobweite from 4000 to 650 cm −1 .
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X-ray photoelectron spectrum of the U4f electron region for shinkolobweite.

X-ray photoelectron spectrum of the U4 f electron region for shinkolobweit... Available to Purchase

Published: 29 September 2023
Fig. 5. X-ray photoelectron spectrum of the U4 f electron region for shinkolobweite.
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AVERAGE, MINIMUM, AND MAXIMUM BOND-VALENCE SUMS FOR ATOMS IN THE COMMENSURA... Available to Purchase

Published: 29 September 2023
TABLE 6. AVERAGE, MINIMUM, AND MAXIMUM BOND-VALENCE SUMS FOR ATOMS IN THE COMMENSURATELY MODULATED STRUCTURE OF SHINKOLOBWEITE
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The Raman spectrum of shinkolobweite taken with a 532 nm laser collected from 1900 to 100 cm−1.

The Raman spectrum of shinkolobweite taken with a 532 nm laser collected fr... Available to Purchase

Published: 29 September 2023
Fig. 4. The Raman spectrum of shinkolobweite taken with a 532 nm laser collected from 1900 to 100 cm −1 .
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Dark reddish-brown prisms of shinkolobweite (Shk.), orange fourmarierite (Frm.), and pale rutherfordine (Rth.) atop massive uraninite (not visible). Horizontal field of view is 1.0 mm.

Dark reddish-brown prisms of shinkolobweite (Shk.), orange fourmarierite (F... Available to Purchase

Published: 29 September 2023
Fig. 1. Dark reddish-brown prisms of shinkolobweite (Shk.), orange fourmarierite (Frm.), and pale rutherfordine (Rth.) atop massive uraninite (not visible). Horizontal field of view is 1.0 mm.
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Secondary electron image of an aggregate of shinkolobweite showing complex termination. Use of general Miller index notation for some faces is due to the fact that interfacial angles were not precisely determined for this sample.

Secondary electron image of an aggregate of shinkolobweite showing complex ... Available to Purchase

Published: 29 September 2023
Fig. 2. Secondary electron image of an aggregate of shinkolobweite showing complex termination. Use of general Miller index notation for some faces is due to the fact that interfacial angles were not precisely determined for this sample.
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Sheet components of the shinkolobweite structure projected along (001): (a–c) U3O8 layer, (d) interlayer. (a) A graphical representation of the sheet-anion topology of U3O8 sheets in shinkolobweite. Here, red and yellow nodes indicate anion and cation positions, respectively, while edges linking the anions occurring in U(1) polyhedra [U(2) polyhedra are not depicted]. (b) and (c) Polyhedral representations of α- and β-U3O8 sheets. Anion positions with (OH) and mixed [(OH)xO1−x] occupancy are highlighted in green and brown, respectively (note: the dashed green circle indicates the position of an anion on the opposing side of the sheet and anions with complete O2− occupancy are not highlighted). In (d), the configuration of the Pb-(H2O) interlayer is shown, emphasizing the occurrence of {Pb(1)4} rectangular clusters; the position of the fractionally occupied O(2)’ position is also indicated. The unit cell is outlined in blue.

Sheet components of the shinkolobweite structure projected along (001): (a–... Available to Purchase

Published: 29 September 2023
Fig. 7. Sheet components of the shinkolobweite structure projected along (001): (a–c) U 3 O 8 layer, (d) interlayer. (a) A graphical representation of the sheet-anion topology of U 3 O 8 sheets in shinkolobweite. Here, red and yellow nodes indicate anion and cation positions, respectively
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Ternary diagram illustrating Pbx☐4−x cluster distribution in shinkolobweite. Constrained compositions, as calculated from chemical and site-scattering data, fall along the range indicated by blue shading; the mean composition is shown as the dashed red line.

Ternary diagram illustrating Pb x ☐ 4− x cluster distribution in shin... Available to Purchase

Published: 29 September 2023
Fig. 13. Ternary diagram illustrating Pb x ☐ 4− x cluster distribution in shinkolobweite. Constrained compositions, as calculated from chemical and site-scattering data, fall along the range indicated by blue shading; the mean composition is shown as the dashed red line.
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Aspects of U3O8 sheet topology in shinkolobweite. (a) Chains of edge-sharing pentagonal bipyramids connect by common vertices to form voids in the shape of elongated hexagons. Three possible positions within the hexagonal void that may accommodate U are given by X: U(2)α1, U(2)α2, and U(2)β. The occurrence of U at either of these sites results in the formation of sheets labeled as: (b) α1, (c) α2, and (d) β. For reference, uranium coordination polyhedra are also shown: (e) U(1) and (f) U(2). Selected distances from the averaged structure are shown.

Aspects of U 3 O 8 sheet topology in shinkolobweite. (a) Chains of edge-sh... Available to Purchase

Published: 29 September 2023
Fig. 10. Aspects of U 3 O 8 sheet topology in shinkolobweite. (a) Chains of edge-sharing pentagonal bipyramids connect by common vertices to form voids in the shape of elongated hexagons. Three possible positions within the hexagonal void that may accommodate U are given by X: U (2) α1 , U (2
Journal Article

Mineralogical Association of Canada Free

Journal: Elements
Published: 01 December 2023
Elements (2023) 19 (6): 396–397.
DOI: https://doi.org/10.2138/gselements.19.6.396
... (U and Nb) pegmatite mineral from Argentina, and stibiotantalite (Sb and Ta) from China. A pentavalent U-bearing mineral, shinkolobweite, has been described from the Democratic Republic of Congo, and a new platinum alloy mineral, sidorovite (PtFe3), reported from Russian placer deposits. In addition...
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Graphical representation of {Pb(1)4} clusters in the interlayer of shinkolobweite. In (a) the average geometric configuration is illustrated. Individual Pb(1)–Pb(1) distances are colored as in Figure 8, and the length of each line corresponds to the average values. In (b) the four possible configurations of {Pbx☐4−x} cluster, where x = 0, 1, 2 are illustrated. Only clusters in which Pb-Pb adjacencies along outward edges do not occur (i.e., on green, red, and blue lines) are considered here.

Graphical representation of { Pb (1) 4 } clusters in the interlayer of shin... Available to Purchase

Published: 29 September 2023
Fig. 12. Graphical representation of { Pb (1) 4 } clusters in the interlayer of shinkolobweite. In ( a ) the average geometric configuration is illustrated. Individual Pb (1)– Pb (1) distances are colored as in Figure 8 , and the length of each line corresponds to the average values. In (b
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Bond length variation as a function of structure modulation (t-value) for uranium positions in shinkolobweite: (a) U(1) and (b) U(2). Anion positions correspond to those illustrated in Figure 8. Shaded regions indicate mean values for bond lengths observed in other structures based on α-U3O8 and β-U3O8 sheets (taken from Lussier et al. 2017): pink shading – bond lengths for -eq and -yl bonds; orange shading – U(2)–Φ(7) distances. Averaged structures are given in Supplementary Table S2.

Bond length variation as a function of structure modulation ( t -value) for... Available to Purchase

Published: 29 September 2023
Fig. 9. Bond length variation as a function of structure modulation ( t -value) for uranium positions in shinkolobweite: (a) U (1) and (b) U (2). Anion positions correspond to those illustrated in Figure 8 . Shaded regions indicate mean values for bond lengths observed in other structures