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Clays and Clay Minerals

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Clays and Clay Minerals Encontrados 11 registros  La búsqueda tardó 0.03 segundos. 
1.
7 p, 361.8 KB Letter to the editor : On fougerite / Christianse, B. C. (University of Copenhagen. Nano-Science Center. Department of Chemistry) ; Dideriksen, K. (University of Copenhagen. Nano-Science Center. Department of Chemistry) ; Skovbjerg, L. L. (University of Copenhagen. Nano-Science Center. Department of Chemistry) ; Nedel, S. (University of Copenhagen. Nano-Science Center. Department of Chemistry) ; Stipp, S. L. S. (University of Copenhagen. Nano-Science Center. Department of Chemistry)
Fougerite (IMA 2003-057) was accepted by the Commission on New Minerals and Mineral Names of the International Mineralogical Association (IMA) in 2004 as a new mineral to represent the green rust (GR) family. [...]
2011 - 10.1346/CCMN.2011.0590102
Clays and Clay Minerals, Vol. 59, Núm. 1 (2011) , p. 3-9  
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2.
7 p, 594.6 KB Water-uptake capacity of bentonites / Kaufhold, Stephan (BGR, Bundesanstalt für Geowissenschaften und Rohstoffe) ; Dohrmann, Reiner (LBEG, Landesamt für Bergbau, Energie und Geologie) ; Klinkenberg, M. (Institut für Energieforschung Sicherheitsforschung und Reaktortechnik (IEF-6). Forschungszentrum Jülich GmbH)
The present study compares the water-vapor adsorption capacity of bentonites (natural cation population) with the Enslin-Neff method. Water-vapor adsorption at 50% r. h. (relative humidity) or 70% r. [...]
2010 - 10.1346/CCMN.2010.0580103
Clays and Clay Minerals, Vol. 58, Núm. 1 (2010) , p. 37-43  
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3.
4 p, 652.2 KB Chemical upgrading of sedimentary Na-Chabazite from Bowie, Arizona / Kuznicki, Steven M. (University of Alberta. Department of Chemical and Materials Engineering) ; Lin, Christopher C. H. (University of Alberta. Department of Chemical and Materials Engineering) ; Bian, Junjie (University of Alberta. Department of Chemical and Materials Engineering) ; Ansón-Casaos, Alejandro (University of Alberta. Department of Chemical and Materials Engineering)
Natural zeolites may represent one of the greatest under-utilized resources of the mineral world. Even with their unique character and properties, issues of consistency, homogeneity and purity preclude them from many premium applications. [...]
2007 - 10.1346/CCMN.2007.0550301
Clays and Clay Minerals, Vol. 55, Núm. 3 (2007) , p. 235-238  
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4.
14 p, 581.6 KB Isothermal measurement of heats of hydration in zeolites by simultaneous thermogravimetry and differential scanning calorimetry / Neuhoff, Philip S. (University of Florida. Department of Geological Sciences) ; Wang, Jie (University of Florida. Department of Geological Sciences)
A calorimetric method for determining isothermal partial and integral heats of hydration reactions (ΔH̄ ,, and ΔH̄,TP respectively) in zeolites and other mineral hydrates is presented. The method involves immersing a dehydrated sample in a humid gas stream under isothermal conditions within a thermal analysis device that records simultaneous differential scanning calorimetric (DSC) and thermogravimetric analysis (TGA) signals. [...]
2007 - 10.1346/CCMN.2007.0550302
Clays and Clay Minerals, Vol. 55, Núm. 3 (2007) , p. 239-252  
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5.
7 p, 515.1 KB Inheritance vs. neoformation of kaolinite during lateritic soil formation : A case study in the Middle Amazon basin / Balan, Etienne (Université Paris VI. Institut de Minéralogie et Physique des Millieux Condensés) ; Fritsch, Emmanuel (Université Paris VI. Institut de Minéralogie et Physique des Millieux Condensés) ; Allard, Thierry (Université Paris VI. Institut de Minéralogie et Physique des Millieux Condensés) ; Calas, George (Université Paris VI. Institut de Minéralogie et Physique des Millieux Condensés)
The tropical weathering of sedimentary kaolin deposits from the plateaux surrounding Manaus (Alter do Chao formation, Amazon basin, Brazil) leads to the in situ formation of thick kaolinitic soils. The structural changes of kaolinite have been investigated quantitatively by infrared spectroscopy and electron paramagnetic resonance. [...]
2007 - 10.1346/CCMN.2007.0550303
Clays and Clay Minerals, Vol. 55, Núm. 3 (2007) , p. 253-259  
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6.
24 p, 1.7 MB Formation and transformation of mixed-layer minerals by Tertiary intrusives in Cretaceous mudstones, West Greenland / Drits, Victor A. (Russian Academy of Sciences. Geological Institute) ; Lindgreen, Holger (Geological Survey of Denmark and Greenland) ; Sakharov, Boris A. (Russian Academy of Sciences. Geological Institute) ; Jakobsen, Hans Jorgen (University of Aarhus. Instrument Centre for Solid-State NMR Spectroscopy. Department of Chemistry) ; Fallick, Anthony E. (Scottish Universities Environmental Research Centre) ; Salyn, Alfred L. (Russian Academy of Sciences. Geological Institute) ; Dainyak, Lidia G. (Russian Academy of Sciences. Geological Institute) ; Zviagina, Bella B. (Russian Academy of Sciences. Geological Institute) ; Barfod, Dan N. (Scottish Universities Environmental Research Centre)
In the Nuussuaq Basin, West Greenland, a thick succession of Tertiary dolerites has penetrated Upper Cretaceous mudstone. The mixed-layer minerals of mudstone core samples have been analyzed by X-ray diffraction, solid-state Si and Al magic-angle spinning nuclear magnetic resonance, Mössbauer and infrared spectroscopies, thermal analysis, chemical analysis, stable isotopes (O/O), and K/Ar dating. [...]
2007 - 10.1346/CCMN.2007.0550304
Clays and Clay Minerals, Vol. 55, Núm. 3 (2007) , p. 260-283  
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7.
16 p, 2.4 MB Alteration of spodumene to cookeite and its pressure and temperature stability conditions in Li-bearing aplite-pegmatites from northern Portugal / Bobos, Iuliu (Universidade do Porto) ; Vieillard, Philippe (Université de Poitiers) ; Charoy, Bernard (Ecole Normale Supérieure de Géologie) ; Noronha, Fernando (Universidade do Porto)
The alteration of spodumene to cookeite has been identified in a Li-bearing aplite-pegmatite from northern Portugal. Optical microscopy and scanning and transmission electron microscopy (SEM/TEM) were used to characterize the alteration products in both cookeite + quartz and cookeite, + kaolinite ± mica assemblages. [...]
2007 - 10.1346/CCMN.2007.0550306
Clays and Clay Minerals, Vol. 55, Núm. 3 (2007) , p. 295-310  
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8.
12 p, 1.0 MB Water retention of two natural compacted bentonites / Villar, M. V. (Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (Espanya))
This work presents the water retention curves obtained for two natural bentonites compacted at different dry densities. The density of the bentonite was kept constant during the determination, for which specific methodologies were developed. [...]
2007 - 10.1346/CCMN.2007.0550307
Clays and Clay Minerals, Vol. 55, Núm. 3 (2007) , p. 311-322  
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9.
12 p, 710.4 KB Fougerite, a new mineral of the pyroaurite-iowaite group : Description and crystal structure / Trolard, Fabienne (Géochimie des Sols et des Eaux) ; Bourrié, Guilhem (Géochimie des Sols et des Eaux) ; Abdelmoula, Mustapha (Université Henri Poincaré) ; Refait, Philippe (Université de La Rochelle) ; Feder, Frédéric (Internal Research Unit Environmental Risks of Recycling)
Fougerite (IMA 2003-057) is a mixed M(II)-M(III) hydroxysalt of the green rust group, where M(II) can be Fe or Mg, and M(III) is Fe. The general structural formula is: [Fe -x Fe Mg(OH)] [x/n A. mHO] where A is the interlayer anion and n its valency, with 1/4 ≤ x/(1+y) ≤ 1/3 and m ≤ (1-x+y). [...]
2007 - 10.1346/CCMN.2007.0550308
Clays and Clay Minerals, Vol. 55, Núm. 3 (2007) , p. 323-334  
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10.
18 p, 1.1 MB 'Black' soils in the southern Alps : Clay mineral formation and transformation, x-ray amorphous Al phases and Fe forms / Zanelli, R. (University of Zurich. Department of Geography) ; Egli, M. (University of Zurich. Department of Geography) ; Mirabella, A. (Research Institute for Soil Study and Conservation) ; Abdelmoula, Mustapha. (Laboratoire de Chimie Physique et Microbiologique pour l'Environnement) ; Plötze, Michael (Institute for Geotechnical Engineering.) ; Nötzli, M. (University of Zurich. Department of Geography)
Many soils in southern Switzerland have a black color, contain a large amount of soil organic matter (SOM) and seem to have some andic properties although they did not develop on volcanic parent material. [...]
2006 - 10.1346/CCMN.2006.0540606
Clays and Clay Minerals, Vol. 54, Núm. 6 (2006) , p. 703-720  
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11.
15 p, 669.8 KB Reductive degradation of p,p'-DDT by Fe(II) in nontronite NAu-2 / Fialips, Claire I. (Newcastle University. School of Civil Engineering and Geosciences) ; Cooper, Nicola G. A. (Newcastle University. School of Civil Engineering and Geosciences) ; Jones, D. Martin (Newcastle University. School of Civil Engineering and Geosciences) ; White, Maggie L. (Newcastle University. School of Civil Engineering and Geosciences) ; Gray, Neil D. (Newcastle University. School of Civil Engineering and Geosciences)
Clay minerals are abundant in soils and sediments and often contain Fe. Some varieties, such as nontronites, contain as much as 40 wt. % FeO within their molecular structure. Several studies have shown that various Fe-reducing micro-organisms can use ferric iron in Fe-bearing clay minerals as their terminal electron acceptor, thereby reducing it to ferrous iron. [...]
2010 - 10.1346/CCMN.2010.0580610
Clays and Clay Minerals, Vol. 58, Núm. 6 (2010) , p. 821-836  
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