Synthesis, crystallographic data, solubility and electrokinetic properties of meta-zeunerite, meta-kirchheimerite and nickel-uranylarsenate

Vochten, R.; Goeminne, A. M.

doi:10.1007/bf00308011

Cited by 19 publications

(27 citation statements)

References 7 publications

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“…[14][15][16][17] Owing to the higher solubility of uranyl-phosphate minerals compared with uranyl-arsenates (with solubility products of 10 −12.8 and 10 −49.2 for metatorbernite and metazeunerite, respectively), 24 it might be expected that arsenate end-members of this mineral family would dominate over the phosphate end-members, which is indeed observed in the Rietveld analysis of data shown in Fig. 3b, and composition inferred from interpolation of the unit cell volume of the end members.…”

Section: Discussionmentioning

confidence: 99%

“…These sequences are underlain by kaolinitic clay. 24 A series of samples, taken from locations 10-20 m apart, were collected, by hand, at the surface (0-2 cm depth) from both sample locations, and at a shallow depth (25 cm) at the DF location. Soil preparation and bulk characterisation Soils were dried in air and sieved to a particle size of <300 µm, removing organic litter.…”

Section: Site and Soil Samplingmentioning

confidence: 99%

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Multi-scale investigation of uranium attenuation by arsenic at an abandoned uranium mine, South Terras

et al. 2017

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Detailed mineralogical analysis of soils from the UK's historical uranium mine, South Terras, was performed to elucidate the mechanisms of uranium degradation and migration in the 86 years since abandonment. Soils were sampled from the surface (0-2 cm) and near-surface (25 cm) in two distinct areas of ore processing activities. Bulk soil analysis revealed the presence of high concentrations of uranium (<1690 p.p.m.), arsenic (1830 p.p.m.) and beryllium (~250 p.p.m.), suggesting pedogenic weathering of the country rock and ore extraction processes to be the mechanisms of uranium ore degradation. Micro-focus XRF analysis indicated the association of uranium with arsenic, phosphate and copper; µ-XRD data confirmed the presence of the uranylarsenate minerals metazeunerite (Cu(UO 2 ) 2 (AsO 4 ) 2 ·8H 2 O) and metatorbernite (Cu(UO 2 ) 2 (PO 4 ) 2 ·8H 2 O) to be ubiquitous. Our data are consistent with the solid solution of these two uranyl-mica minerals, not previously observed at uranium-contaminated sites. Crystallites of uranyl-mica minerals were observed to coat particles of jarosite and muscovite, suggesting that the mobility of uranium from degraded ores is attenuated by co-precipitation with arsenic and phosphate, which was not previously considered at this site.

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Section: Discussionmentioning

confidence: 99%

Section: Site and Soil Samplingmentioning

confidence: 99%

Multi-scale investigation of uranium attenuation by arsenic at an abandoned uranium mine, South Terras

et al. 2017

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“…Based on X-ray powder diffraction data, they reported that assignment of hkl indices is not reliable, if it is based of unit-cell parameters given by Walenta (1964). Moreover, none of the three published powder diffraction patterns is consistent, differing namely in number of diffractions and intensities (Walenta 1964;Vochten and Goeminne 1984;Nabar and Iyer 1977). Based on the results of thermal analysis, Vochten and Goeminne (1984) Locock et al (2004) reported solved crystal structure for a synthetic analogue of metakirchheimerite (named as "CoUAs8") and also for synthetic dodecahydrate, corresponding to up to now species with doubtful status, "kirchheimerite".…”

Section: Previous Studiesmentioning

confidence: 97%

“…cm -3 (calculated). Vochten and Goeminne (1984) published the synthesis, crystallographic data, solubility products and electrokinetic properties of synthetic metazeunerite, metakirchheimerite and, by that time unknown in natural occurrence, uranylarsenate of nickel (corresponding to new mineral IMA-2008-50 -metarauchite, Plášil et al 2008Plášil 2009). Vochten and Goeminne (1984) described synthetic metakirchheimerite as heptahydrate, which is in contrary both to the results of Walenta (1964) and to the currently used definition.…”

Section: Previous Studiesmentioning

confidence: 99%

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New data for metakirchheimerite from Jáchymov (St. Joachimsthal), Czech Republic

Plášil¹,

Čejka²,

Sejkora³

et al. 2012

J. Geosci.

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Metakirchheimerite was found only on a few samples from the Jan Evangelista vein at the "Adit level" of the Svornost shaft, Jáchymov (St. Joachimsthal) ore district, Krušné Hory/Erzgebirge Mountains, Czech Republic. It forms rare crystalline aggregates consisting of fine tabular crystals reaching 0.1 mm in size, which are very brittle, having light pink to light orange colour, with a high vitreous lustre. Metakirchheimerite crystalline aggregates occur on carbonate gangue with disseminated primary minerals: arsenopyrite, uraninite and skutterudite. Studied metakirchheimerite is a (sub-)recent alteration product of the primary minerals, connected to the old open mine adit environment. According to electron microprobe analyses, the empirical formula of metakirchheimerite can be expressed, based on As + P = 2 apfu, as: . Both infrared and Raman spectra of metakirchheimerite exhibited stretching and bending vibrations of (UO 2 ) 2+ , (AsO 4 ) 3-, (PO 4 ) 3-and H 2 O groups. The vibration bands of all these units were tentatively assigned. The U-O bond lengths in uranyl and O-H…O hydrogen bond lengths, which were inferred from the spectra, are consistent with published crystal structure data for a synthetic analogue of metakirchheimerite.

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Physico-chemical study of heterogeneous equilibria in salt-aqueous systems of inorganic compounds of uranium(VI)

Черноруков

Нипрук

2006

Czech J Phys

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The report presents results obtained in systematic investigation of the physico-chemical state of heterogeneous equilibrium systems of "aqueous solution -precipitate" in the case of the crystalline mineral-like uranium (VI) compounds with the general formula M k (AnUO 2 ) k ⋅nH 2 O, where positions denoted as "An" are occupied by VO 4 3-, PO 4 3-, AsO 4 3-, HSiO 4 3-, or BO 3 3-anions, and M k are alkaline, alkaline earth, and the 3d-transition elements. Chemical stabilities and solubilities of uraniumvanadates, uraniumphosphates, uraniumarsenates, uraniumsilicates, and uraniumborates have been experimentally determined. Detailed quantitative description of the physico-chemical processes and reactions involved in heterogeneous equilibrium in aqueous solutions of the salts by means of equilibrium thermodynamics is presented. The description gives us the possibility to predict the behaviour of the uranium compounds under different conditions and to calculate Gibbs functions of the formation of the compounds studied.

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Synthesis, crystallographic data, solubility and electrokinetic properties of meta-zeunerite, meta-kirchheimerite and nickel-uranylarsenate

Cited by 19 publications

References 7 publications

Multi-scale investigation of uranium attenuation by arsenic at an abandoned uranium mine, South Terras

Multi-scale investigation of uranium attenuation by arsenic at an abandoned uranium mine, South Terras

New data for metakirchheimerite from Jáchymov (St. Joachimsthal), Czech Republic

Physico-chemical study of heterogeneous equilibria in salt-aqueous systems of inorganic compounds of uranium(VI)

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