Thermodynamic properties, low-temperature heat-capacity anomalies, and single-crystal X-ray refinement of hydronium jarosite, (H3O)Fe3(SO4)2(OH)6

Majzlan, Juraj; Stevens, Rebecca; Boerio‐Goates, Juliana; Woodfield, Brian F.; Navrotsky, Alexandra; Burns, Peter C.; Crawford, M. K.; Amos, T. G.

doi:10.1007/s00269-004-0405-z

Cited by 80 publications

(91 citation statements)

References 24 publications

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“…The room-temperature structure was solved in space group R3m using direct methods. The space group choice R3m (R int = 0.034) is in agreement with previous single-crystal studies of Na jarosite and H 3 O jarosite (Grohol et al 2003;Nestola et al 2013;Majzlan et al 2004;Plášil et al 2014;Spratt et al 2014).…”

Section: Crystal Structure Refinementsupporting

confidence: 77%

“…The hydronium oxygen atom O4 was located at the 3m site (3a Wyckoff site, coordinates 0, 0, 0) which is in agreement with H 3 O jarosite studies (Plášil et al 2014;Majzlan et al 2004). However, a potential displacement of O4 along the c axis was discussed in previously published work (Wills and Harrison 1996;Majzlan et al 2004;Spratt et al 2014) because the hydronium ion has usually 3m symmetry, which is inconsistent with 3m symmetry of hydronium in H 3 O jarosite.…”

Section: Crystal Structure Refinementsupporting

confidence: 63%

“…Similar low-temperature effects could be inferred for H 3 O jarosite by comparing studies undertaken at room temperature (e.g. Majzlan et al 2004;Plášil et al 2014) and 173 K (Spratt et al 2014). However, results from low-temperature data are still too limited to allow an extrapolation of structural mechanisms to other compositions within the jarosite group.…”

Section: Introductionmentioning

confidence: 53%

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Single-crystal X-ray diffraction study of synthetic sodium–hydronium jarosite

et al. 2016

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Section: Crystal Structure Refinementsupporting

confidence: 77%

Section: Crystal Structure Refinementsupporting

confidence: 63%

Section: Introductionmentioning

confidence: 53%

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Single-crystal X-ray diffraction study of synthetic sodium–hydronium jarosite

et al. 2016

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“…The presence of hydronium (H 3 O) + is usually inferred from low alkali content in the mineral, as it is difficult to measure directly (Alpers et al 1989, Stoffregen et al 2000. On the basis of an interpretation of singlecrystal X-ray-diffraction data on synthetic hydronium jarosite, Majzlan et al (2004) concluded that the D site in jarosite-group minerals may not be fully occupied, such that the hydronium content reported by difference should be considered a maximum value.…”

Section: Sulfate Minerals At the Richmond Minementioning

confidence: 99%

The Composition of Coexisting Jarosite-Group Minerals and Water From the Richmond Mine, Iron Mountain, California

Jamieson

Robinson

Alpers

et al. 2005

The Canadian Mineralogist

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Jarosite-group minerals accumulate in the form of stalactites and fine-grained mud on massive pyrite in the D drift of the Richmond mine, Iron Mountain, California. Water samples were collected by placing beakers under the dripping stalactites and by extracting pore water from the mud using a centrifuge. The water is rich in Fe 3+ and SO 4 2-, with a pH of approximately 2.1, which is significantly higher than the extremely acidic waters found elsewhere in the mine. Electron-microprobe analysis and X-ray mapping indicate that the small crystals (<10 mm in diameter) are compositionally zoned with respect to Na and K, and include hydronium jarosite corresponding to the formula (H 3 O) 0.6 K 0.3 Na 0.1 Fe 3+ 3 (SO 4 ) 2 (OH) 6 . The proton-microprobe analyses indicate that the jarosite-group minerals contain significant amounts of As, Pb and Zn, and minor levels of Bi, Rb, Sb, Se, Sn and Sr. Speciation modeling indicates that the drip waters are supersaturated with respect to jarosite-group minerals. The expected range in composition of jarosite-group solid-solution in equilibrium with the pore water extracted from the mud was found to be consistent with the observed range in composition.

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“…These calculations are used mainly for silicates. Due to the lack of data for compounds not related to silicates, we could only use the method of Latimer (1951) (Majzlan et al, 2004), using adiabatic and semi-adiabatic calorimetry. For the same mineral, applying the method of Latimer (1951), using the data from gives an error of 4.2 to 8.4 J/mol·K, but certainly higher for more complex compounds.…”

Section: Calorimetric Datamentioning

confidence: 99%

Synthesis, characterization and thermochemistry of synthetic Pb–As, Pb–Cu and Pb–Zn jarosites

Forray

Smith

Navrotsky

et al. 2014

Geochimica et Cosmochimica Acta

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The enthalpy of formation from the elements of well characterized Pb-As, Pb-Cu, measured by high temperature oxide melt solution calorimetry and gave !Hº f = -3691.2 ± 8.6 kJ/mol, !Hº f = -3653.6 ± 8.2 kJ/mol, and !Hº f = -3669.4 ± 8.4 kJ/mol, respectively. Using estimated entropies, the standard Gibbs free energy of formation from elements at 298 K !Gº f of the three compounds were calculated to be -3164.8 ± 9.1 kJ/mol, -3131.4 ± 8.7 kJ/mol, and -3153.6 ± 8.9 kJ/mol, respectively. Based on these free energies, their logK sp values are -13.94 ± 1.89, -4.38 ± 1.81 and -3.75 ± 1.80, respectively. For tis compounds, a log 10 {Pb 2+ } -pH diagram is presented. The diagram shows that the formation of Pb-As jarosite may decrease aqueous arsenic and lead concentrations to meet drinking water standards. The new thermodynamic data confirm that transformation of Pb-As jarosite to plumbojarosite is thermodynamically possible.

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Thermodynamic properties, low-temperature heat-capacity anomalies, and single-crystal X-ray refinement of hydronium jarosite, (H3O)Fe3(SO4)2(OH)6

Cited by 80 publications

References 24 publications

Single-crystal X-ray diffraction study of synthetic sodium–hydronium jarosite

Single-crystal X-ray diffraction study of synthetic sodium–hydronium jarosite

The Composition of Coexisting Jarosite-Group Minerals and Water From the Richmond Mine, Iron Mountain, California

Synthesis, characterization and thermochemistry of synthetic Pb–As, Pb–Cu and Pb–Zn jarosites

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