... carbonate, uranyl hydroxide and uranyl ions are adsorbed by colloidal hydrous ferric oxide or basic zinc carbonate. Upon crystallization of the adsorbent, the uranium is either returned to solution or forms discrete uranium minerals within the former adsorbent. GeoRef, Copyright 2006, American Geological...

... uranyl hydroxide/hydrate, containing only traces of other metals (<1 wt% in total). Bulk (mg) samples always contain admixtures of metaschoepite (purest samples have ~80 wt% paulscherrerite). A thermogravimetric analysis corrected for the presence of metaschoepite contamination leads to the empirical...

... intensities and subsequently dividing by the number of mineral species included in each oxyanion subgroup. For example, spectra for 10 uranyl hydroxide species are included in in the average spectrum for this mineral group. The normalized intensities at each wavenumber were summed and then divided by 10...

... ) is built from uranyl oxide-hydroxide sheets that adopt the fourmarierite topology, with interlayer Na + and H 2 O groups. Both the sheet and interlayer topology mimic those observed in natural and synthetic Na-metaschoepites studied previously, and as seen in other uranyl oxide hydrate minerals, charge...

...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...

... et al. 2005 ; Armstrong et al. 2012 ), uranyl oxide hydroxide minerals ( Forbes et al. 2011 ; Hanson et al. 2005 ), and uranyl silicates ( Forbes et al. 2011 ) come in contact with peroxide-bearing aqueous solutions. The current findings demonstrate most uranyl phosphates in the metaautunite...

... and which have proved useful in discriminating other uranyl oxy-hydroxides, silicates, and phosphates. The first reported luminescence emission and excitation spectra for vandenbrandeite revealed near-negligible luminescence, with a slightly enhanced signal for the specimen displaying poorer crystallinity...

...F igure 15. An alteration sequence of uranyl oxy-hydroxides to uranyl phosphates is observed to be the last stage of uranyl mineral evolution. Autunite [Ca(UO 2 ) 2 (PO 4 ) 2 ·10–12(H 2 O)] and its many isomorphs are among the most common of the more than 40 species of uranyl phosphates...

.... As far as we know, no reliable vibrational spectroscopy assignments exist in the literature for synthetic uranyl hydroxide chloride phases, except those of Bullock and Parret ( 1970 ), for instance. Thus, the following assignments are based primarily upon those for uranyl oxide hydroxide hydrate (UOH...

...Leo J. Miller Abstract Several uranium complex ions have been found to be stable over a wide range of pH, temperature, and pressure. At 25 degrees C and in neutral solutions uranyl complexes of carbonate, fluoride, and hydroxide remain in solution at concentration values between 10 (super -5) M...

..., and ~175 moderately strong hydrogen-bonded hydroxyl-containing compounds and 35 minerals with very strong H-bonded hydroxides was used to obtain mean total polarizabilities. These data, using the Anderson-Eggleton relationship α T = ( n D 2 − 1 ) V m 4 π + ( 4 π 3 − c ) ( n D 2 − 1 ) where α T = the total...

...Harald G. Dill; Stephan Kaufhold; Berthold Weber; Axel Gerdes Abstract Nontronite has been reported from a wide range of mineral deposits on the continent and in marine environments, commonly associated with basic igneous rocks, base-metal sulfides, Fe sulfides, Fe–Mn oxide–hydroxides and gold...

..., including 99 Ru—a daughter of 99 Tc, was mainly retained as ruthenium arsenide (± Pb, Co, Ni, and S). Although RZOKE generally appears well preserved, partially dissolved galena and uraninite, as well as the presence of accessory anglesite(?) and lead-uranyl sulfate hydroxide hydrate, suggest that recently...

...Figure 4. A polyhedral representation of the uranyl oxide hydroxide sheet (yellow) in leesite, with ball-and-stick interlayer containing water oxygen (red) and potassium (blue). (Color online.) ...