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Comprehensive investigation of the liberation characteristics of pyrite ...
Abstract A technique has been developed for generating scanning electron microscope images of sections of polished coal and coal particles that are suitable for the measurement of the linear intercept distribution functions and the distribution of three-phase linear grades. The three phases used are; pyrite, ash forming minerals, and coal.
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Pyrite Uses and Meaning - Crystal Vaults
An iron sulfide mineral, Pyrite is commonly found around the world in a variety of geological formations, from sedimentary deposits to hydrothermal veins, and as a constituent of metamorphic rocks. It forms in masses, stalactites, grains, globes, striated cubes or twelve-sided pentagonal dodecahedral crystals.
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Oxidation of Pyrite - Acid Mine Drainage:From Waste to Resources - Ebrary
It occurs as an accessory mineral in igneous rocks, in vein deposits with quartz and sulphide minerals, and in sedimentary rocks, such as shale, coal, and limestone (Rafferty, 2020). Pyrite is sometimes called fool's gold because of its similarity to gold in colour (brassy-yellow) and shape (King, 2020a; Rafferty, 2020). However, pyrite is ...
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Mineralogy, Spatial Distribution, and Isotope Geochemistry of Sulfide ...
The Biwabik Iron Formation (BIF), which is located along the Mesabi Range in NE Minnesota, was deposited in the near shore environment of the Paleoproterozoic Animikie Basin. Although mined for natural ore and taconite, it does contain measurable amounts of sulfide minerals, as pyrite and pyrrhotite.
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Rapid pyritization in the presence of a sulfur/sulfate-reducing ...
There are two generally accepted pathways for pyrite formation, both starting from an FeS ( e.g. mackinawite) precursor: the polysulfide 8, 9 pathway via which zero-valent sulfur acts as an oxidant...
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Sedimentary pyrite formation: An update - ScienceDirect
Pyrite forms during shallow burial, via the reaction of detrital iron minerals with H^S. The H;S. in turn, is produced by the reduction of interstitial dissolved sulfate by bacteria using sedi- mentary organic matter as a reducing agent and energy source.
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Comprehensive investigation of the liberation characteristics of pyrite ...
The three phases used are; pyrite, ash forming minerals, and coal. The phase-to-phase transition probabilities for the unbroken ore can also be estimated using conventional image analysis techniques. The distribution of linear intercept lengths through the pyrite, ash and coal phases were found to be described by sums of 2, 3 and 4 exponentials ...
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Direct Detection of Fe(II) in Extracellular Polymeric Substances (EPS ...
In the case of pyrite leaching, non-contact leaching is mainly promoted by planktonic microbes, which oxidize the reduced Fe and S in solution. The resulting Fe (III) ions come into contact with a mineral surface and work as an oxidizing agent, which promotes mineral dissolution.
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The process of pyrite formation mangrove soils
That is, pyrite is mainly formed in a boundary zone between the upper more oxidized horizons and the lower strongly reduced horizons. In this zone, H,S formed in the lower horizons will react with ferric compounds deposited in the upper horizons. Most of the ferric compounds are the pseudomorphs of microorganisms including
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Pyrite formation and mineral transformation pathways upon sulfidation ...
Abstract The reaction of ferric (hydr)oxides with dissolved sulfide does not lead to the instantaneous production of thermodynamically stable products but can induce a variety of mineral transformations including the formation of metastable intermediates. The importance of the various transformation pathways depends, among other factors, on the characteristics of the ferric (hydr)oxides but a ...
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Formation processes of framboidal pyrite | Semantic Scholar
Framboids and sunflowers are the most ubiquitous shapes of sedimentary pyrite. Framboids are spherical aggregates of nanocrystals, while sunflowers are formed by overgrowth of framboids and represent.. 2. Highly Influenced. View 4 excerpts, cites background and methods.
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Scientists decipher, catalog the diverse origins of Earth's minerals
Nature has used 21 different ways over the last 4.5 billion years to create pyrite (aka Fool's Gold) -- the mineral world's champion of diverse origins. ... of every known process of formation ...
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Formation of Pyrite Spherules From Mixtures of Biogenic FeS and Organic ...
The formation of pyrite framboids is often assumed to ... were repeated with the same batch of starting material while biogenic ones were restarted from the cultivation process. 2.3 Mineralogical Characterization ... both the abiotic and biogenic starting materials led to residues containing the same mineral assemblage: pyrite (at 75 and 150°C ...
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Influence of calcium ion and pH on oxidation rates and secondary ...
introduced into the description of the pyrite oxidation process, the fitting rate constant also reflected Ca2+ had a remarkable effect on pyrite oxidation process at pH 12 but a weak influence on it at pH 6 and 9, separately. The formation of goethite, magnetite, and hematite on the pyrite surface after
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Pyrite Oxidation Kinetics - How Fast does Pyrite Oxidize
The mechanism of pyrite oxidation may therefore be written as a series of steps: 1. Preferrential release of ferrous ions to form a reacted sulfur layer (S) FeS2 → (S) + Fe++ + 2 e-...................... (11) 2. Hydrolysis of ferrous ions to form ferrous hydroxide Fe++ + 2 OH- + Fe (OH)2................... (12) 3.
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Pyrite - Sandatlas
Pyrite. Pyrite is the most abundant and widespread sulfide mineral (FeS 2 ). It rarely makes up the bulk of the rock, but it frequently occurs in rocks. It is a common mineral in sedimentary rocks, especially if they contain or contained organic matter. It is also a very common hydrothermal mineral. Few hydrothermal veins are without it.
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Scientists decipher, catalog the diverse orig | EurekAlert!
image: Nature has used 21 different ways over the last 4.5 billion years to create pyrite (aka Fool's Gold) -- the mineral world's champion of diverse origins.
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Minerals | Free Full-Text | Mineral Chemistry of the Lower Cretaceous ...
The source of iron material and the mineralization process of iron skarn deposits within the eastern North China Craton are ambiguous. In this study, we present new mineral chemical data of the Jinling skarn deposit, located in western Shandong Province, east China. Based on the petrography study and mineral chemical data, we suggest that the Jinling iron skarn deposit is hydrothermal and the ...
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Replacement/Recrystallization - Petrified Wood Museum
Replacement and mineralization are terms used to describe this fossilization process (Garcia & Miller, 1998, p. 15). Part of the ammonite shell above has been replaced by the mineral pyrite. The replacement of soft or hard body parts may occur when minerals precipitate out of solution due to the action of bacteria or pH changes.
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Role of pyrite in formation of hydroxyl radicals in coal: possible ...
The overall process can be catalytic as the ferric iron formed in the reactions can be reduced by ... Låg M, Becher R: Mineral composition other than quartz is a critical determinant of the particle inflammatory potential. Int J Hyg Environ Health 2002 ... Mechanisms of sedimentary pyrite formation. Geological Society of America Special Paper ...
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Pyrite mineral information and data - Dakota Matrix
Pyrite. Named for the Greek word for "fire," pyr, as sparks can be produced from striking it. Pyrite is the most widespread and abundant sulfide in the world and van be found in tens of thousands of localities with large and/or fine crystal being produced from Italy on Elba and at Piedmont, in Spain, Kazakhstan, in the United States from ...
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Pyrite: its rapid formation in a salt marsh and its importance in ...
Pyrite: its rapid formation in a salt marsh and its importance in ecosystem metabolism ...
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Sedimentary pyrite formation: An update - NASA/ADS
Sedimentary pyrite formation during early diagenesis is a major process for controlling the oxygen level of the atmosphere and the sulfate concentration in seawater over geologic time. The amount of pyrite that may form in a sediment is limited by the rates of supply of decomposable organic matter, dissolved sulfate, and reactive detrital iron minerals.
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Greigite: a true intermediate on the polysulfide pathway to pyrite ...
The formation of pyrite is an important geochemical pathway linking the global biogeochemical cycles of iron, sulfur and carbon in anoxic sediments [1-3].Furthermore, chemical reactions involved in pyrite formation have important implications for the fate and mobility of toxic [4, 5] and radioactive [] metals in near-surface environments.Over the past half century, the formation of pyrite ...
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Mineral matter and the nature of pyrite in some high-sulfur tertiary ...
Coal samples collected from four different sources in the Jaintia Hills of Meghalaya, northeast India, have been investigated for their sulfur content, mineral matter, and to assess their potential behavior upon beneficiation. These coals contain high sulfur which occurs both in organic and inorganic forms. The organic sulfur content is much higher than the inorganic sulfur.
WhatsApp:+8617329420102Scanning Force Microscopy Studies of the Colonization and Growth of A ...
pyrite surface, forming a tight mineral seal between the cell and the pyrite substrate. These bacteria subsequently may grow under pH neutral conditions, biooxidizing the un-derlying pyrite; this process creates etch pits in the pyrite. On average, these etch pits are 1.2 microns in lateral di-mension and approximately 220 nm deep.
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The causes behind pyrite oxidation - and acid mine drainage
When exposed to air, like in a mine, pyrite will fully oxidize in a matter of years. Microorganisms can also form on the mineral and speed up the reaction. The oxidation process happens quickly ...
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Earth & Environmental Sciences | College of Science and Engineering
It marks 150 years since the first geoscience course was taught at the University of Minnesota! In 1872, professor Edward H. Twining M.A. taught the first courses in geology and mineralogy. 1872 also marks the establishment of the Minnesota Geological and Natural History Survey by the Minnesota State Government.
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5.2 Chemical Weathering - Physical Geology
The runoff from areas where this process is taking place is known as acid rock drainage (ARD), and even a rock with 1% or 2% pyrite can produce significant ARD. Some of the worst examples of ARD are at metal mine sites, especially where pyrite-bearing rock and waste material have been mined from deep underground and then piled up and left ...
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Pyrite Framboid Formation Chemistry | Framboids | Oxford Academic
Pyrite formation is therefore key to understanding framboid formation, although framboids formed by other minerals may test these ideas, as discussed in Chapter 8. In this context, formation is an ill-defined term since the formation of pyrite in framboids is divided into two processes: nucleation and crystal growth.
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Hydrothermal Ore Minerals: Composition, Distribution and Formation ...
The authors of this paper showed that processes of mineral ore formation evolved in the interior of modern hydrothermal-magmatic systems of an island arc during transition from progressive to regressive development stage (Rychagov et al., 2000). ... Ore minerals (pyrite) as indicators of structure, fluid and geochemical regimes in the interior of
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The Many Faces of Fool's Gold | American Scientist
The glittering golden mineral pyrite, an iron sulfide (FeS 2), is known to most people as fool's gold, something that promises great value but is intrinsically worthless. But pyrite is, has been, and will be important to you and the rest of humankind: It is the mineral that made the modern world. ... This led to the idea that pyrite formation ...
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Secondary Sulfate Minerals from Thallium Mineralized Areas ... - MDPI
The oxidation/weathering of pyrite (FeS2) and other sulfide minerals introduces a high metal (e.g., Fe, Mn, Tl, Cu, Ni) concentration and sulfate into the surrounding environment. However, the formation of secondary sulfate could critically mediate the metal releasing process due to incorporating metal and sulfate into the secondary minerals.
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Shotgun proteomics study of early biofilm formation process of ...
High-throughput proteomics has been applied to study the early process of biofilm formation on pyrite by At. ferrooxidans ATCC 23270. After 24 h contact with the mineral, planktonic and sessile (biofilm) cell subpopulations were separated and proteins extracted. In total, 1319 proteins were detected in both samples.
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Abiotic Pyrite Formation Produces a Large Fe Isotope ... - Science
The pyrite-forming process is mechanistically uniform over the 25° to 125°C temperature range ( 13 ), and the observed temperature-independent effect indicates that our results may be extrapolated with reasonable confidence to ambient temperatures.
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Pyrite Oxidation Mechanism by Oxygen in Aqueous Medium
When pyrite is exposed to the environment, due to natural processes or anthropogenic activities, it is oxidized, forming sulfuric acid in the presence of humidity. This process consequently contributes to the acidification of natural waters, such as rivers, streams, and lakes.
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Pyrite, Coal, Kentucky Geological Survey, University of Kentucky
Pyrite (FeS 2) is the most common sulfide mineral in coal and a major source of the sulfur in coal.Pyrite can form in peat while the peat is accumulating, or can form in peats from the introduction of sulfate (SO 4) into the peat if the peat was buried by marine waters (such pyrite is called syngenetic or authigenic pyrite).Within the buried peat, the sulfate is reduced to sulfide (S 2), which ...
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FMF - Friends of Minerals Forum, discussion and message board :: View ...
The interpretation of the gossan suggest that the formation taken place in two stages: oxidation of underlying pyrite, with formation of jarosite group minerals, and second, weathering with formation of goethite and, in the latter phase, hematite.
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Pyrite Mineral | Properties, Uses, Occurrence & more...
Uses Area. Pyrite was once used as a source of sulfur, but is now only a minor ore for both sulfur and iron. Pyrite from some localities is auriferous, and therefore is used as an ore of gold in gold-bearing localities. Pyrite was polished by the Native Americans in the early times and used as mirrors. Today, it is used as an ornamental stone ...
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Acid sulfate soils explained | Environment, land and water - Queensland
This process turns pyrite into sulfuric acid, which can cause damage to the environment and to buildings, roads and other structures. The acid also attacks soil minerals, releasing metals like aluminium and iron. ... View larger image The components required for acid sulfate soil formation Time. Time is required for pyrite to accumulate. Unlike ...
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