... the alteration of dehydrated schoepite, UO 3 (H 2 O), and soddyite, [(UO 2 ) 2 (SiO 4 )](H 2 O) 2 , in the presence of aqueous solutions containing hydrogen peroxide. Crystalline samples were reacted with various concentrations of hydrogen peroxide and the resulting material was analyzed by powder X-ray...

...Amanda L. Klingensmith; Peter C. Burns Abstract Alteration of spent nuclear fuel in a geological repository under oxidizing conditions may result in uranyl compounds and incorporation of Np-237 into uranyl alteration phases could impact repository performance. Powders of synthetic soddyite, (UO 2...

...D. H. Gorman Abstract New observations are made on the rare uranium silicate mineral soddyite. The formula 5UO 3 ·2SiO 2 )·6H 2 O is established as the most plausible. New crystallographic data are recorded: orthorhombic, a = 8.32, b = 11.21, c =18.71 A; space group Fddd . Powder data are presented...

...Eric P. Plesko; Barry E. Scheetz; William B. White Abstract Synthesis studies in the system K 2 O-UO 3 -SiO 2 -H 2 O are presented as an isothermal isobaric projection through the system at 300°C and 30 MPa. In addition to the compatibility relationships for weeksite, boltwoodite, and soddyite...

... 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...

... 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...

...Fig. 1 Gauthierite crystals with typical terminations on a matrix of uraninite-bearing quartz gangue with tiny yellow soddyite; field of view 1 mm. Photograph by T. Olds. (Online version in colour.) ...

... honors geologist and conservationist Reginald Claude Sprigg (1919–1994), founder of the Arkaroola Tourist Station. Together with beta-uranophane, soddyite, kasolite, Ce-rich francoisite-(Nd), metatorbernite, billietite, Ba-bearing boltwoodite, schoepite, metaschoepite, and weeksite, spriggite results...

...Fig. 10 Bipyramidal orange crystals of soddyite with long-prismatic crystals of rutherfordine. Shinkolobwe mine, Congo, Africa. FOV 2.5 mm (photo P. Škácha). ...

... the mineral soddyite. This structure is composed of uranyl silicate chains that are crossbonded by sharing a common silicon to give a three-dimensional framework structure. A new triclinic uranyl silicate mineral was discovered during this study, although there is not enough sample to describe it adequately...