Structures of sodium alumino-germanate sodalites [Na8(Al6Ge6O24)A2, A = Cl, Br, I]

Fleet, Michael E.

doi:10.1107/s0108270188013964

Cited by 40 publications

(29 citation statements)

References 7 publications

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“…The rapid diffusion of F-Cl-OH along the c-axis direction in apatite-group minerals has been attributed to the location of these anions in the c-axis channels (Brenan 1993). The Cl -and Br -ions in scapolite-group minerals and sodalite are located in large cages surrounded by rings of (Al,Si) tetrahedra (Papike & Zoltai 1965, Fleet 1989) and, unlike F-Cl-OH in apatite-group minerals, are not confined to channels. Also, the Br -ion (1.96 Å) is significantly larger than F -, OH -and Cl -(1.33, 1.37 and 1.81 Å, respectively; Shannon 1976).…”

Section: Results Of Exchange Experiments and Factors Controlling The mentioning

confidence: 99%

“…This approximately equal uptake of Cl and Br by scapolitegroup minerals and sodalite is probably attributable to their accommodation in the large structural cages of these framework aluminosilicates (Papike & Zoltai 1965, Fleet 1989. Fleet (1989) …”

Section: Results Of Exchange Experiments and Factors Controlling The mentioning

confidence: 99%

“…The low accelerating voltage was used here to reduce the beam size (see below). Peak-overlap interference between Al and Br was corrected for manually, and was monitored by analyzing a synthetic crystal of end-member Na 8 (Al 6 Ge 6 )O 24 Br 2 (Fleet 1989).…”

Section: Electron-microprobe Analysismentioning

confidence: 99%

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Bromine in Scapolite-Group Minerals and Sodalite: XRF Microprobe Analysis, Exchange Experiments, and Application to Skarn Deposits

Pan¹,

Dong²

2003

The Canadian Mineralogist

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Application of an X-ray fluorescence (XRF) microprobe for the analysis of single grains (80 to 1,000 m in diameter) of Clrich minerals for Br has been evaluated for fluorapatite, chlorapatite, scapolite-group minerals (marialite and meonite) and sodalite. A calibration curve based on the Br contents in four international reference materials has been confirmed by measurements on Brbearing standard solutions and by agreement with the results of Cl-rich minerals from instrumental neutron-activation analyses. Absolute errors associated with individual XRF microprobe analyses (i.e., counting statistics alone) are less than 5%, and the calculated limit of detection in the analysis of single mineral grains is ~1 ppm Br. Matrix and grain-size effects are shown to be negligible. Experiments at 1 atmosphere and 800 to 1000°C yield the following distribution coefficients for Br-Cl exchanges between marialite or sodalite and hydrous NaCl-NaBr melts: K D marialite-melt = 0.97 ± 0.08 and K D sodalite-melt = 0.9 ± 0.1. Therefore, the Cl/Br values in marialite and sodalite closely reflect the halogen proportions of their coexisting melts or fluids. The diffusivity of Br in sodalite follows an Arrhenius relation: D Br = 6.5 ϫ 10 -7 exp(-270 ± 10kJ/mol/RT) m 2 /s, over the temperature range from 800 to 1000°C. D Br in marialite is 1.7 ± 0.3 ϫ 10 -19 m 2 /s at 800°C. The Cl/Br weight ratios of marialite in the Tieshan Fe skarn deposit, China, cluster around 650 ± 40, supporting an origin involving hydrothermal brines from associated evaporites. Scapolitegroup minerals in the exoskarns of the Nickel Plate Au skarn deposit, British Columbia, have Cl/Br from 560 to 570, higher than those (130 to 180) of their counterparts in the endoskarns and vuggy cavities. This variation is attributable to an increased involvement of magmatic water from distal to proximal zones. Similarly, scapolite-group minerals in the Grenville U-Th-Mo-REE pegmatite-skarn-vein deposits vary widely in Cl/Br, from 80 to 380, indicative of mixed sources of hydrothermal fluids. This study shows the potential of Br analysis of Cl-rich silicate minerals for constraining the sources and evolution of hydrothermal fluids.Keywords: XRF microprobe, Br, scapolite-group minerals, sodalite, exchange experiments, distribution coefficient, diffusion coefficient, skarn deposits. SOMMAIRENous évaluons l'application d'une microsonde à fluorescence X pour l'analyse de grains isolés (de 80 à 1,000 m de diamètre) pour le Br dans les minéraux porteurs de Cl comme la fluorapatite, la chlorapatite, les minéraux du groupe de la scapolite tels marialite et méionite, et sodalite. Le calibrage a été fait au moyen des teneurs en brome de quatre étalons internationaux, et a été confirmé avec des résultats obtenus pour des solutions standards contenant du Br et des minéraux riches en Cl analysés par activation neutronique instrumentale. Les erreurs absolues associées à une seule analyse par microsonde à fluorescence X, dues aux seules erreurs de comptage, sont inférieures à 5%, et le ...

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Section: Results Of Exchange Experiments and Factors Controlling The mentioning

confidence: 99%

Section: Results Of Exchange Experiments and Factors Controlling The mentioning

confidence: 99%

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Bromine in Scapolite-Group Minerals and Sodalite: XRF Microprobe Analysis, Exchange Experiments, and Application to Skarn Deposits

Pan¹,

Dong²

2003

The Canadian Mineralogist

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“…Mo as (Na 6 Al 6 Si 6 O 24 ) (NaMoO 4 ) 2 [7] . In addition, sodalite structures are known to retain B [8], Ge [9], I [9,6], and Br [9,6] in the cage like structures. Indeed, waste stabilization at Argonne National LaboratoryWest (ANL-W) currently uses a glass-bonded sodalite ceramic waste form (CWF) for disposal of electrorefiner wastes for sodium-bonded metallic spent nuclear fuel from the EBR II fast breeder reactor [10,11].…”

Section: X-ray Diffraction Analysis Of the Fbsr Mineral Productmentioning

confidence: 99%

Characterization and Performance of Fluidized Bed Steam Reforming (FBSR) Product as a Final Waste form

Jantzen

2006

Ceramic Transactions Series

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“…danalite (Fe 4 (Deer et al, 1963). These cagestructured sodalites are also found to retain Mo, Cs, Sr, B, Ge, I and Br (Buhl et al, 1989;Deer et al, 1963;Fleet, 1989). Regardless of the oxidation state of sulfur during FBSR processing, the feldspathoid minerals can accommodate sulfur as either sulfate or sulfide.…”

Section: Major Mineral Form Attributesmentioning

confidence: 99%

Radionuclide and Contaminant Immobilization in the Fluidized Bed Steam Reforming Waste Product

Neeway¹,

Qafoku²,

Westsik³

et al. 2012

Radioactive Waste

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Structures of sodium alumino-germanate sodalites [Na8(Al6Ge6O24)A2, A = Cl, Br, I]

Cited by 40 publications

References 7 publications

Bromine in Scapolite-Group Minerals and Sodalite: XRF Microprobe Analysis, Exchange Experiments, and Application to Skarn Deposits

Bromine in Scapolite-Group Minerals and Sodalite: XRF Microprobe Analysis, Exchange Experiments, and Application to Skarn Deposits

Characterization and Performance of Fluidized Bed Steam Reforming (FBSR) Product as a Final Waste form

Radionuclide and Contaminant Immobilization in the Fluidized Bed Steam Reforming Waste Product

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