 | | Journal (article/letter/editorial) | | been detected at the ppm level in W1, sphalerite, goethite and hematite. Germanium occurs at ppm levels in...amounts in hemimorphite, goethite and hematite. Indium has low concentrations in goethite and hematite. These...mineral assemblage (e.g. smithsonite, cerussite, goethite). The aim of the present study was to evaluate...cerussite, smithsonite, vanadates, phosphates, goethite and hematite. In detail, (Fig. 1b) it is possible...(hemimorphite, chrysocolla), oxides (magnetite, hematite, goethite, zincite, psilomelane, wulfenite and cuprite) |  | | Journal (article/letter/editorial) | | elsevier.com/locate/gca Dissolution mechanisms of goethite in the presence of siderophores and organic acids...ligand-controlled iron oxide dissolution. The rates of goethite dissolution at pH 6 in the presence of low molecular...rapid additions of high citrate concentrations to goethite-oxalate suspensions. The concentration of the...siderophores and organic acids on the solubility of goethite is shown in Figure EA-1 of the electronic annex...reactions (Mast and Drever, 1987; Samson and Eggleston, 1998; Samson and Eggleston, 2000; Teng et al. |  | Poot, Julien, Verhaert, Michèle, Dekoninck, Augustin, Oummouch, Abdellah, El Basbas, Abdelaziz, Maacha, Lhou, Yans, Johan (2020) Characterization of Weathering Processes of the Giant Copper Deposit of Tizert (Igherm Inlier, Anti-Atlas, Morocco) Minerals, 10 (7) 620 doi:10.3390/min10070620 | Journal (article/letter/editorial) | | Life-Earth-Environment (ILEE), Université of Namur, Rue de Bruxelles 61, 5000 Namur, Belgium; michele-alexandra.verhaert@unamur...Geology Department of the University of Namur (Namur, Belgium) and at the Laboratorio Petrografico (OMT...at the Microscopy Service of the University of Namur. Geochemical analyses were carried out on twenty-five...RETSCH PM 100 planetary ball mills (University of Namur) in order to obtain the maximum 125 µm grain size...iron-oxyhydroxides, are observed in quartz veins. Hematite and goethite associated to calcite, dolomite and quartz are |  | Chassé, Mathieu, Blanchard, Marc, Cabaret, Delphine, Juhin, Amélie, Vantelon, Delphine, Calas, Georges (2020) First-principles modeling of X-ray absorption spectra enlightens the processes of scandium sequestration by iron oxides. American Mineralogist, 105 (7). 1099-1103 doi:10.2138/am-2020-7308 | Journal (article/letter/editorial) | | scandium either incorporated in or adsorbed on goethite and hematite, at concentrations relevant for the...water, and biota), iron oxides, in particular goethite [a-FeO(OH)] and hematite (a-Fe2O3), are ubiquitous...of accessory Sc minerals in supergene contexts (Samson and Chassé 2016) implies that its sequestration...Sc-substituted (ca. 1 wt%), and Sc-adsorbed (ca. 0.1 wt%) goethite and hematite, and Sc-adsorbed montmorillonite...chloride hexahydrate powder. Scandium-substituted goethite was prepared by maintaining a ferrihydrite suspension |  | | Journal (article/letter/editorial) | | studied. Chert layers that are well exposed at Point Samson, 20 km north-northeast of Roebourne consist of...chert is characterized by a high concentration of goethite. Most cherts contain thin layers characterized...banded iron-formations (BIFs) exposed at Point Samson in the Pilbara Block, Western Australia. The chert...Cleaverville Formation in the Gorge Creek Group at Point Samson, 20 km to the northnortheast of Roebourne (Fig... Therefore, sedimentary rocks exposed at Point Samson are likely to have deposited before about 3.0 Ga |  | | Journal (article/letter/editorial) | | active sites on ␣-Fe2O3 at pH 3 and pH 6 SHERRY D. SAMSON*,† and CARRICK M. EGGLESTON Department of Geology...the respective trivalent metal ions (Samson et al., 2000). Samson et al. (2000) related the pH-dependence...in diameter (Sugimoto et al., 3675 3676 S. D. Samson and C. M. Eggleston 1993), confirmed by SEM. The...they relate to mineral dissolution may be found in Samson et al. (2000). The experimental apparatus, reagents...described for hematite and In2O3 in section 2.3., Samson et al. (2000), with the following exceptions: the |  | Bouabdellah, Mohammed, Boukirou, Wissale, Potra, Adriana, Melchiorre, Erik, Bouzahzah, Hassan, Yans, Johan, Zaid, Khadra, Idbaroud, Mohammed, Poot, Julien, Dekoninck, Augustin, Levresse, Gilles (2021) Origin of the Moroccan Touissit-Bou Beker and Jbel Bou Dahar Supergene Non-Sulfide Biomineralization and Its Relevance to Microbiological Activity, Late Miocene Uplift and Climate Changes. Minerals, 11 (4) 401 doi:10.3390/min11040401 | Journal (article/letter/editorial) | | Environment Department, University of Liège, 4000 Liège, Belgium; Hassan.Bouzahzah@uliege.be Institute of Life-Earth-Environment...Life-Earth-Environment (ILEE), University of Namur, 5000 Namur, Belgium; johan.yans@unamur.be (J.Y.); julien...and Environment (GeMMe) of University of Liège (Belgium). The SEM-EDS analyses were carried out using a...Corporation, Massachusetts, USA) at the University of Namur (Belgium). Carbon and oxygen isotope analyses were carried...connellite, and abundant iron oxide minerals (goethite and hematite) ([5] and this present study; Figure |  | | Journal (article/letter/editorial) | | subsequently trapped in the lateritic duricrust by goethite. Scandium 21 mobilisation appears in this horizon...increases upward as a result of the dissolution of goethite, possibly assisted 22 by dissolved organic matter...duricrust. The higher affinity of 25 scandium for goethite relative to hematite drives scandium mobilisation...mineral species are identified in Earth materials (Samson and Chassé, 2016). The 3d outer electronic 37...solubility below 10−6 mol · L−1 (Wood 66 and Samson, 2006). However, Sc does not occur in minerals |  | | Journal (article/letter/editorial) | | sodium, nitrate, and aluminate solutions SHERRY D. SAMSON,1,* KATHRYN L. NAGY,1 and WORTH B. COTTON III2...Box 4478, Houston, TX 77060, USA 399 400 S. Samson, K. L. Nagy, and W. B. Cotton III Table 1. Microprobe...concentration of free OH–. Direct titration of the reactor (Samson et al., 2000) was not carried out; pH within the...instantaneous, change in release rate at t ⫽ 0 (see Samson et al., 2000). Consequently, Eqn. 4 models only...after a multipoint baseline correction. 402 S. Samson, K. L. Nagy, and W. B. Cotton III Fig. 2. Recurrent |  | | Journal (article/letter/editorial) | | studied the sorption of trace and heavy metals on goethite-like iron oxide nanoparticles with X-ray absorption...Felmy (2005) found that certain edges of 2–8 nm goethite nanoparticles give rise to potential binding sites...1997; Liu et al., 1998b; Samson and Eggleston, 1998; Wang et al., 1998; Samson and Eggleston, 2000; Eggleston...particle edges. Based on molecular modeling of 2–8 nm goethite particles, protons tend to accumulate in these...indicate that the dielectric field near the edges of goethite nanoparticles may be heterogeneous, leading to |  | | Journal (article/letter/editorial) | | significant concentrations of this metal (Schock, 1975; Samson and Chassé, 2016). Furthermore, because of the...weathered rock, saprolite, limonitic laterite (mainly goethite), and hematitic laterite. Significantly, the highest...The high capacity of ferric oxyhydroxides, e.g., goethite, to adsorb metals likely ensured the enrichment...weathered rock, saprolite, limonitic laterite (mainly goethite), and hematitic laterite (Fig. 4). Locally, however...scandium (80 vol %) is adsorbed onto the surface of goethite and the remaining 20 vol % has substituted for |  | Qafoku, Nikolla P., Qafoku, Odeta, Ainsworth, Calvin C., Dohnalkova, Alice, McKinley, Susan G. (2007) Fe-solid phase transformations under highly basic conditions. Applied Geochemistry, 22 (9) 2054-2064 doi:10.1016/j.apgeochem.2007.04.023 | Journal (article/letter/editorial) | | pathway leading to the formation of hematite and goethite. The newly formed Fe oxy-hydroxides may increase...provide evidence on the formation of hematite and goethite and provide insights on the role of factors such...and Lasaga, 1998; Bickmore et al., 2001, 2006; Samson et al., 2005). In addition, earlier research showed...that of Si and Al, which led to the formation of goethite and hematite as will be shown in the next sections...HBHA treatment. Needle-like small crystals of goethite are shown in these micrographs, while the l-XRD |  | | Journal (article/letter/editorial) | | selected-area electron diffraction (SAED) analyses to be goethite. Another mineral contains relatively high amounts...Chlorite Ferrihydritea Fluorite Galena Gibbsite Goethite Gypsum Hydronium jarosite Jarosite K-feldspars...supersaturated with respect to amorphous iron hydroxide and goethite (Fig. 4). In addition, the pore water in the oxidation...highpressure and temperature environments (Wood and Samson, 2000). Similarly, the low-temperature aqueous...and Na. A similar approach was taken by Wood and Samson (2000) to simulate WO4 complexation in high-temperature |  | Eggleston, Carrick M., Stack, Andrew G., Rosso, Kevin M., Higgins, Steven R., Bice, Angela M., Boese, Steven W., Pribyl, Richard D., Nichols, Jeremy J. (2003) The structure of hematite (α-Fe2O3) (001) surfaces in aqueous media: scanning tunneling microscopy and resonant tunneling calculations of coexisting O and Fe terminations. Geochimica et Cosmochimica Acta, 67 (5) 985-1000 doi:10.1016/s0016-7037(02)01200-0 | Journal (article/letter/editorial) | | and (photo)reductive dissolution (Stumm, 1992; Samson et al., 2000), we have not yet clearly coupled...crystallographically bounded regions covered by apparent goethite crystallites (Fig. 3) oriented preferentially...orientations. According to Barrón et al. (1997), goethite grown epitaxially on hematite has its [001] direction...the steady-state dissolution rate of hematite (Samson et al., 2000) is consistent with, on average, removal...those of an ordered termination (Samson and Eggleston, 1998; Samson et al., 2000), disturb the local |  | | Journal (article/letter/editorial) | | found to be the case also for a data set with goethite. In competitive systems with PO34 , the models...et al. studied the adsorption of molybdate onto goethite, gibbsite and clay minerals (e.g., Goldberg et...which follow the general trend described above for goethite. No data set has been found that treats the adsorption... to dominate the speciation of adsorbed Mo to goethite, as judged from measurements of the proton coadsorption...from extrapolation of data obtained by Wood and Samson (2000) to room temperature. The model fits was |  | | Journal (article/letter/editorial) | | complexation for di- and tricarboxylate ligands on goethite. Surface complexation structures that we postulate...dissolution pathway. A proton-promoted rate is possible (Samson and Eggleston, 1998) but apparently negligible...bidentate mononuclear surface structure for oxalate on goethite at pH ⫽ 5.0. This assignment also agrees with...part of an undergraduate research project. Sherry Samson, Holly Chelf, Jeong-Ho Han, and Stephan Hug provided...(1999) Outer-sphere adsorption of Pb(II)EDTA on goethite. Geochim. Cosmochim. Acta 63, 2957–2969. Becker |  | | Journal (article/letter/editorial) | | interface: I. Fe, Al, and In sesquioxides SHERRY D. SAMSON,*,† LISA L. STILLINGS,‡ and CARRICK M. EGGLESTON...(Chou and Wollast, 1984; Spokes and Jickells, 1996; Samson and Eggleston, 1998), increases in ligand concentration...study of nonsteady state hematite dissolution (Samson and Eggleston, 1998) showed that following downward...NVReno, Reno, NV 89557 USA. 3471 3472 S. D. Samson, L. L. Stillings, and C. M. Eggleston depletion...ions. The model originally developed for hematite (Samson and Eggleston, 1998) is refined in order to describe |  | | Journal (article/letter/editorial) | | techniques indicate the presence of schwertmannite and goethite in the upper 5 cm of the passive treatment reactive...schwertmannite tends to transform over time to goethite (Bigham et al. 1996; Burton et al. 2007; Jönsson...distribution and higher intensity of jarosite and goethite diffractogram peaks compared to those of schwertmannite...schwertmannite peaks are hidden by those of jarosite and goethite. To solve this problem, DXRD can be used (Dold...precipitated, and schwertmannite changes through time to goethite. Within this passive treatment system, it is possible |  | Raphael Cabral, A., Lehmann, B., Kwitko, R., Jones, R. D., Pires, F. R. M., Rocha Filho, O. G., Innocentini, M. D. (2001) Palladium-oxygenated compounds of the Gongo Soco mine, Quadrilátero Ferrífero, central Minas Gerais, Brazil. Mineralogical Magazine, 65 (2) 169-179 doi:10.1180/002646101550208 | Journal (article/letter/editorial) | | together with kaolinite, talc, manganese oxide, goethite and small amounts of tourmaline and rutile. Quartz...which are very similar to the Fe-hydroxide matrix (goethite), A. RAPHAEL CABRAL ETAL. in lesser amounts...elemental mercury (e.g. Krupp, 1988; Wood and Samson, 1998), or even as a chloride complex in highly...transported as chloride complexes (e.g. Wood and Samson, 1998; and references therein). As hydrothermal...conditions (e.g. Shikina et al., 1988; Wood and Samson, 1998). Finally, the shear-related microfractures |  | Borer, Paul, Kraemer, Stephan M., Sulzberger, Barbara, Hug, Stephan J., Kretzschmar, Ruben (2009) Photodissolution of lepidocrocite (γ-FeOOH) in the presence of desferrioxamine B and aerobactin. Geochimica et Cosmochimica Acta, 73 (16) 4673-4687 doi:10.1016/j.gca.2009.05.049 | Journal (article/letter/editorial) | | approximately three times higher on lepidocrocite than on goethite, where surface concentrations between 0.04 and...lmol/m2 have been reported (150 lM DFOB, 13 g/L goethite, I = 0.01 M NaClO4, pH 3–9) (Kraemer et al., 1999)...adsorption experiments with acetohydroxamic acid on goethite indicated that hydroxamate surface complexes have...release of kinetically labile iron from the surface (Samson and Eggleston, 1998, 2000; Eggleston et al., 2004;...(Ghosh et al., 2003). Reductive dissolution of goethite was also observed at pH 3 in the dark by acid- |  | | Journal (article/letter/editorial) | | indicated the presence of either poorly crystalline goethite or gibbsite. This endotherm was particularly intense...Fe oxide minerals on the XRD patterns suggested goethite of low crystallinity. The IR spectra of the clay...Si4+ in the silica tetrahedral sheet (Schofield & Samson, 1954). It is likely, however, that the latter...allophane (Parfitt, 1990) and oxidic minerals such as goethite which is present in varying amounts in these soils...the substitution of Ti4§ and/or M n 4+ in the goethite structure. However, Marcano-Martinez & McBride |  | | Journal (article/letter/editorial) | | Street, Montreal, Quebec, Canada H3A 2A7 IAIN M. SAMSON, Department of Earth Sciences, University of Windsor...al., 1994; Campbell et al., 1995; Levasseur and Samson, 1996). An example of an environment in which REE...pyritohedra, which are variably altered to hematite-goethite, and as rare inclusions in P1 fluorite. The textural...bastnaesite, Ca bastnaesite, accessory celestite, and goethite/hematite pseudomorphs after pyrite. Thin fluorite...masses, and as inclusions in quartz. Pyrite, or its goethite/hematite-altered equivalent, is concentrated mainly |  | Mondillo, Nicola, Arfè, Giuseppe, Herrington, Richard, Boni, Maria, Wilkinson, Clara, Mormone, Angela (2018) Germanium enrichment in supergene settings: evidence from the Cristal nonsulfide Zn prospect, Bongará district, northern Peru. Mineralium Deposita, 53 (2) 155-169 doi:10.1007/s00126-017-0781-1 | Journal (article/letter/editorial) | | deposit. Germanium concentrations measured in both goethite (mean values 100 to 229 ppm, max 511 ppm) and...deposits . Critical elements . Hemimorphite . Goethite . Sphalerite . Laser ablation LA-ICP-MS Introduction...standard element (29Si for hemimorphite, 57Fe for goethite and hematite, and 66Zn for sphalerite) were determined...612 for hemimorphite and GSD-1G glass (USGS) for goethite. External calibration with GSD-1G glass gave element...chalcopyrite in sphalerite; Mnoxy-hydroxides in goethite and hematite) or the crossing of grain boundaries |  | | Journal (article/letter/editorial) | | and willemite. The gangue assemblage includes goethite, hematite, and amorphous silica or quartz. Minor...typically composed of a reddish oxide assemblage of goethite, hematite, and amorphous silica or quartz. In...the willemite as aqueous germanic acid (Wood and Samson 2006), resulting in the even lower Ge–Pb values...and cryptocrystalline. Cerussite, smithsonite, goethite, and hematite carry low amounts of trace elements...Soc Econ Geol Spec Publ 4, pp 350–355 Wood SA, Samson IM (2006) The aqueous geochemistry of gallium, |  | Yuan, Wei, Saldi, Giuseppe D., Chen, JiuBin, Vetuschi Zuccolini, Marino, Birck, Jean-Louis, Liu, Yujie, Schott, Jacques (2018) Gallium isotope fractionation during Ga adsorption on calcite and goethite. Geochimica et Cosmochimica Acta, 223. 350-363 doi:10.1016/j.gca.2017.12.008 | Journal (article/letter/editorial) | | fractionation during Ga adsorption on calcite and goethite Wei Yuan, Giuseppe D. Saldi, JiuBin Chen, Marino...fractionation during Ga adsorption on calcite and goethite, Geochimica et Cosmochimica Acta (2017), doi:...fractionation during Ga adsorption on calcite and goethite Wei Yuan a,b, Giuseppe D. Saldi c, JiuBin Chen...fractionation during its adsorption on calcite and goethite was investigated at 20 °C as a function of the...Gasolid-solution up to -1.27 ‰ and -0.89 ‰ for calcite and goethite, respectively. Comparison of Ga isotopic data |
|
