...D. H. Gorman The only recorded occurrence of sklodowskite is that of Shinkolobwe, Belgian Congo. New x-ray data are reported, and it is concluded that structural differences preclude complete isomorphism between sklodowskite and uranophane and that sklodowskite is the product of supergene...

... of siltstone within the Triassic Shinarump conglomerate. Associated minerals are gypsum, cuprite, antlerite, goethite, lepidocrocite, mbobomkulite, hydrombobomkulite, sklodowskite and two undefined uranium minerals. Oswaldpeetersite occurs as micrometric prismatic crystals (approximately 0.1 × 1 × 02 mm...

... and thermodynamic calculations. The formation of saleeite, Mg(UO 2 ) 2 (PO 4 ) 2 ·10H 2 O, is the predominant mechanism for U fixation upstream from the deposit, where saléeite replaces sklodowskite and granular apatite. Within the deposit and further downstream, U is fixed in microcrystals (10–50 nm) of saléeite...

... hexavalent and pentavalent uranium from the Shinkolobwe mine, Democratic Republic of Congo. Crystals of shinkolobweite are dark reddish-brown prisms up to 0.5 mm in length, occurring on a matrix of massive uraninite associated with fourmarierite, rutherfordine, soddyite, and sklodowskite. Crystals...

...F igure 4. Uranyl silicate sheets from uranophane-group minerals: ( a ) uranophane, boltwoodite, cuprosklodowskite, sklodowskite, and kasolite; ( b ) β-uranophane; ( c ) oursinite. ...

...Frances V. Stohl; Deane K. Smith Abstract The uranyl silicate minerals have been divided into three groups on the basis of their uranium to silicon ratios. The 1:1 group includes uranophane, beta-uranophane, boltwoodite, sodium boltwoodite, kasolite, sklodowskite, and cuprosklodowskite. A structure...

... and is then usually composed of kasolite or an unidentified phase (Mineral B). Soddyite and sklodowskite occur rarely. There are minor variations in the above general sequence. It some specimens the core may be orange-red gummite without residual uraninite or the original uraninite crystal may be wholly converted...

...F ig . 4. Structures of uranyl silicates. (a) The uranophane anion-topology and representation of anion topology as a chain-stacking sequence. (b) The sheet that occurs in α-uranophane, boltwoodite, sklodowskite, cuprosklodowskite, and kasolite, all of which have a U:Si ratio of 1:1. (c...

...F igure 5. EXAFS (left) and FT (right) spectra for the uranophane group minerals ( a ) boltwoodite, ( b ) cuprosklodowskite, ( c ) kasolite, ( d ) sklodowskite, and ( e ) α-uranophane. Solid lines represent experimental data; dashed lines represent fits. ...

...F igure 6. The amorphization fluence, F c , and the absorbedelectronic dose, D c , for other uranyl silicates. Plotted as a function of the increasing atomic mass of the cations substituting for Ca. U-Ca, U-Sr, and U-Eu have the uranophane structure (open circles). U-Mg is sklodowskite...

...Table 1. U–Th dating samples from a variety of worldwide deposits. Museum no. Mineral name* ‘Age’ (ka) Error (ka, 2σ) Locality** Deposit age Ref. M37839 sklodowskite 315.6 21.5 Eva mine, Northern Territory, Australia ~900 Ma [1] M36227 parsonsite 240.9 10.1 Ranger...

....1986.177.14.247 . Mokeeva , V. ( 1959 ) The Crystal Structure of Sklodowskite. Doklady Akademii Nauk SSSR , 124 . ( Vernadskii Inst. of Geochemistry and Analytical Chemistry .) Olds , T.A. , Plášil , J. , Kampf , A.R. , Simonetti , A. , Sadergaski , L.R. , Chen , Y.-S...