Ammoniomagnesiovoltaite, a New Voltaite-Related Mineral Species From Pecs-Vasas, Hungary

Szakáll, Sándor; Sajó, István E.; Fehér, Béla; Bigi, Simona

doi:10.3749/canmin.50.1.65

Cited by 19 publications

(21 citation statements)

References 6 publications

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“…This method identified the presence of ammoniomagnesiovoltaite. Although the ammonium content obviously cannot be measured by LA-ICP-MS, the content of other elements coincides with those reported in [53]. All analyses show that sulfate minerals contain not only inherited elements from pyrite, but also new introduced elements.…”

Section: Chemical Composition Of the Identified Efflorescent Mineralssupporting

confidence: 80%

“…It can be seen that V, Cr, and Mn came from external sources. Manganese mostly partitions among voltaite, ammoniomagnesiovoltaite, and magnesiocopiapite, where it enters in the M 2+ position of Fe 2+ as reported by [53,69,72,73]. Nickel and Co show affinity to copiapite, halotrichite, and voltaite, also occuring in M 2+ .…”

Section: Partitioning Of Inherited Trace Elements In Sulfatesmentioning

confidence: 73%

“…Phosphorus occurs as a PO 4 3− tetrahedral oxyanion. As it is seen, voltaite group minerals incorporate most trace elements, as inferred in [53,72,73].…”

Section: Sources Of Introduced Elements In Sulfates and Incorporationmentioning

confidence: 73%

“…The analysis time was 100 s, comprising a 40-s measurement of background and a 60-s analysis with a laser-on the sample. The acquisition dwell time for all masses was set to 0.01 s. The following isotopes were monitored in pyrite: 49 Ti, 51 V, 53 Cr, 55 Mn, 57 Fe, 59 Co, 60 Ni, 65 Cu, 66 Zn, 71 Ga, 73 Ge, 75 As, 77 23 Na, 25 Mg, 27 Al, 29 Si, 31 P, 39 K, 42 Ca, 45 232 Th, and 238 U, monitored in sulfates. Analyses were performed on predefined areas of the polished pyrite-containing samples to avoid mineral inclusions.…”

Section: Laser Ablation Inductively Coupled Plasma Mass Spectrometry mentioning

confidence: 99%

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Efflorescent Sulfate Crystallization on Fractured and Polished Colloform Pyrite Surfaces: A Migration Pathway of Trace Elements

2019

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The colloform pyrite variety incorporates many trace elements that are released in the environment during rapid oxidation. Colloform pyrite from the Chiprovtsi silver-lead deposit in Bulgaria and its oxidation efflorescent products were studied using X-ray diffractometry, scanning electron microscopy, electron microprobe analysis, and laser ablation inductively coupled plasma mass spectrometry. Pyrite is enriched with (in ppm): Co (0.1ammoniomagnesiovoltaite were identified in the efflorescent sulfate assemblage. Sulfate minerals contain not only inherited elements from pyrite (Cr, Fe, Co, Ni, Cu, Zn, Ag, In, As, Sb, Hg, Tl, and Pb), but also newly introduced elements (Na, and Th). Voltaite group minerals, copiapite, magnesiocopiapite, and römerite incorporate most of the trace elements, especially the most hazardous As, Sb, Hg, and Tl. Colloform pyrite occurrence in the Chiprovtsi deposit is limited. Its association with marbles would further restrict the oxidation and release of hazardous elements into the environment.Minerals 2020, 10, 12 2 of 25 trace metals, such as thallium, and the production of sulfuric acid. However, its abundance makes pyrite also the major constituent of mine waste and the main contributor to the formation of acid mine drainage in some mining areas. The latter being a result of the high reactivity to oxygen and water. Pyrite oxidation [20][21][22][23][24] leads to the formation of a number of water-soluble sulfates [25][26][27][28][29][30]. Their formation in situ on pyrite-containing wastes in tailing impoundments or other waste storage facilities is more abundant but can be observed during certain environmental conditions, usually employing low humidity. However, the "colloform"/spherulitic pyrite tends to accommodate more trace elements due to the conditions of its formation (supersaturated fluids and rapid crystal growth [31][32][33][34][35][36][37]) and also oxidizes more rapidly to produce efflorescent sulfates due to the larger reactivity area.The phenomenon of sulfate crystallization on samples containing "colloform"/spherulitic pyrite during their laboratory storage gives a unique opportunity of direct observation of this process, and information to what extent the trace elements incorporated in pyrite can be mobilized into the environment and behave as pollutants.In this study, we report data on the trace element composition of colloform pyrite from the Ag-Pb Chiprovtsi deposit (NW Bulgaria) and the mineralogy and trace element composition of the efflorescent sulfates formed during its oxidation in laboratory conditions. The results are interpreted with respect to the partitioning of inherited trace elements among newly formed sulfates and their environmental significance. Geological BackgroundThe Chiprovtsi silver-lead deposit represents the central and eastern part of an ore zone that extends from the outcropping in NW-W direction Sveti Nikola granite to the E of the Zhelezna village in the Western Balkan Mountains (Bulgaria) (Figure 1). The western part of the ore zone is...

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Section: Chemical Composition Of the Identified Efflorescent Mineralssupporting

confidence: 80%

Section: Partitioning Of Inherited Trace Elements In Sulfatesmentioning

confidence: 73%

“…Phosphorus occurs as a PO 4 3− tetrahedral oxyanion. As it is seen, voltaite group minerals incorporate most trace elements, as inferred in [53,72,73].…”

Section: Sources Of Introduced Elements In Sulfates and Incorporationmentioning

confidence: 73%

Section: Laser Ablation Inductively Coupled Plasma Mass Spectrometry mentioning

confidence: 99%

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Efflorescent Sulfate Crystallization on Fractured and Polished Colloform Pyrite Surfaces: A Migration Pathway of Trace Elements

2019

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“…Interestingly, other occurrences are restricted to burning coal heaps or similar sites. [15,19,23,24] The structure of clairite has not yet been solved, although Kampf et al [19] have considered a polytypic relationship between carlsonite and clairite. Voltaite, first reported from Solfatara di Pozzuoli near Naples as a fumarolic mineral, [25,26] is a member of the wide voltaite group that comprises either cubic members or a tetragonal-pseudocubic member (see Table 1 [27] Vibrational spectroscopy, and especially Raman spectroscopy, is currently widely used for the characterization and identification of various sulfates, and, therefore, phases commonly found in nature are well described using this technique.…”

Section: Introductionmentioning

confidence: 99%

Raman spectroscopic vibrational analysis of the complex iron sulfates clairite, metavoltine, and voltaite from the burning coal dump Anna I, Alsdorf, Germany

Košek

Edwards

Jehlička

2019

J Raman Spectroscopy

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Vibrational spectroscopy has been used to characterize the three uncommon complex iron sulfates clairite, (NH4)2Fe3(SO4)4(OH)3 3H2O, metavoltine, Na6K2Fe2+Fe3+6(SO4)12O2·18H2O, and voltaite, K2Fe2+5Fe3+3Al(SO4)12 18H2O. The investigated specimens were formed at the burning coal dump Anna I (Alsdorf, Germany) due to alteration processes connected with the subsurface thermal activity. It is found that all three minerals display complex Raman spectra with an extensive proliferation of bands attributed to the sulfate vibrational modes. Both clairite and metavoltine show extraordinary strong Raman bands in the low‐wavenumber region, which can be attributed to the FeO stretching modes. Clairite and metavoltine show a very similar spectral shape; it can be concluded that both minerals can exhibit a similar crystal structure. In comparison, voltaite represents a different structural type; therefore, a distinct Raman spectrum is observed.

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Sulphate supergene minerals: An intuitive indicator for deep deposit in plateau regions

Zhao

2021

Geological Journal

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The world‐class Rongna Cu(Au) deposit, located in the Duolong mining district, is the first epithermal‐porphyry deposit along the Bangong–Nujiang metallogenic belt. The acidic spring developed in the centre of the Rongna Deposit and its basin has a high amount of heavy metals. Therefore, metal elements (Cu, Pb, Zn, Cd, As, Cr and Hg), pH, SO42− of the Rongna River and the composition of its supergene minerals are studied to discuss the environmental influence and provide a theoretical basis for the comprehensive utilization and environmental management of the Rongna Deposit. The result shows that there are eight kinds of supergene minerals: natrojarosite, hexahydrite, tamarugite, anhydrite, pickeringite, bloedite, gypsum and naujakasite, among which, naujakasite is discovered for the first time in China. The material sources of these sulphate minerals and acidic water are from the sulphate in the ores that experience the leaching process and oxidation. The spring is severely acidified, whose pH values are 2.70–3.08, the single pollution index of Cr, Cd, Pb, Hg and As are less than 1, but the index of Cu and Zn exceed the Class III National Water Standard by about twice, showing a mild pollution, its comprehensive pollution index values 0.8 ~ (<2.5), showing good quality. The pH of Rongna River water values are 7.70–7.92, the single pollution index is less than 1, indicating no pollution, and the comprehensive pollution index is less than 0.8, indicating good quality. However, considering the vulnerable ecological environment in Tibet, the acidic spring still needs manual intervention. An open‐air reservoir can be built upstream of the acidic spring, and the pollutants can precipitate by natural evaporation and then be recycled.

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Ammoniomagnesiovoltaite, a New Voltaite-Related Mineral Species From Pecs-Vasas, Hungary

Cited by 19 publications

References 6 publications

Efflorescent Sulfate Crystallization on Fractured and Polished Colloform Pyrite Surfaces: A Migration Pathway of Trace Elements

Efflorescent Sulfate Crystallization on Fractured and Polished Colloform Pyrite Surfaces: A Migration Pathway of Trace Elements

Raman spectroscopic vibrational analysis of the complex iron sulfates clairite, metavoltine, and voltaite from the burning coal dump Anna I, Alsdorf, Germany

Sulphate supergene minerals: An intuitive indicator for deep deposit in plateau regions

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