Physical Properties of Pyrrhotite : Cleavage: {0001} Imperfect, {1120} Imperfect : Color: Bronze, Bronze red, Dark brown. Density: 4.58 - 4.65, Average = 4.61 : Diaphaneity: Opaque : Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern. Habit: Massive - Granular - Common texture observed in granite and other igneous ...
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· The pyrrhotite group encompasses a wide range of natural and synthetic iron-sulphur phases with the generic formula Fe 1−x S, where x is between 0 ⩽ x ⩽ 0.125 and a crystal structure of the NiAs type [1–3].Stoichiometric FeS (x = 0) is known as troilite and has a hexagonal NiAs-type structure.Stoichiometry alterations introduced via different arrangements …
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· The samples of pyrrhotite and pentlandite came from the Sudbury and Manitoba mining regions of Canada, respectively. Analytical work on the samples showed no significant impurity in the pyrrhotite (0.17% Cu and 0.02% Ni). However, X-ray diffraction analysis of pentlandite samples indicated the presence of some pyrrhotite, pyrite and low ...
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Pyrrhotite (Fig. 1.11) is an unusual iron sulfide with variable iron content [Fe (1−x) S (x=0–0.2) ]. The color ranges between bronze yellow and copper-red with black streak and metallic luster. …
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· significant amounts of pyrrhotite and a selective removal of pyrrhotite would reduce the Fe content in the final concentrate without losing valuable metals. A non-oxidative leaching process could potentially selectively dissolve pyrrhotite, without losing metal values to the solution. This forms the basis of this thesis 2+
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Pyrrhotite and pentlandite are the most common Fe sulfide minerals in magmatic ore deposits and meteorites. Multiple S isotopes pairing with Fe isotopes of bulk Fe sulfides have proven to be useful tracers to constrain the formation and evolution of magmatic ore deposits. However, pyrrhotite coexists with pe
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The variation of iron in Pyrrhotite's structure is also responsible for more than one crystal symmetry type, allowing it to form in both hexagonal and monoclinic symmetries. Multiple crystal symmetries should technically classify Pyrrhotite as a mineral group rather than a single mineral, but a sub-classification is rarely made due to polytypes appearing similar and perhaps even …
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· The pyrrhotite regions have a metal-to-sulfur ratio of 0.86, and a nickel content of <1 atom%. The pentlandite contains 27.2 atom% nickel and has a metal-to-sulfur ratio of 1.07. TEM analyses confirm that the phases are pentlandite and 4C monoclinic pyrrhotite. An SAED pattern from the twinned [110]/[010] zone axes of 4C monoclinic pyrrhotite ...
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Pyrrhotite-11C. This page is currently not sponsored. Click here to sponsor this page. Formula: Fe10S11. This formula is approximate. These "polytypes" of pyrrhotite are really polytypoids …
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Magnetic Properties of Pyrrhotite. Pyrrhotite is similar to another iron sulfide mineral named troilite. Troilite has a chemical composition of FeS, while pyrrhotite's chemical composition is Fe (1-x) S. Pyrrhotite is deficient in iron because some of the iron sites in its crystal lattice are …
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pyrrhotite. 1. n. [Drilling Fluids] A mineral containing ferrous sulfide, FeS, that typically contains inclusions of free sulfur and other minerals. It is commonly present in shales, and may occur as a trace mineral in some barite ores. Pyrrhotite can liberate sulfides in alkaline muds, with adverse consequences for safety and corrosion.
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· A review on pyrrhotite oxidation. The non-stoichiometric compounds of iron sulphide named pyrrhotite (Fe) in sulphidic ores and their waste products. The factors affecting pyrite and pyrrhotite oxidation are similar but the latter has received much less attention. As it is the case for pyrite, an increase in temperature has an increasing effect ...
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pyrrhotite, iron sulfide mineral (Fe1–xS) in the niccolite group; in it, the ratio of iron to sulfur atoms is variable but is usually slightly less than one. It commonly is found with pentlandite and other sulfides in silica-poor igneous rocks, as at …
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· The aim of this study was to synthesize and characterize Fe x-1 S 2D-nanostructures with pyrrhotite phase, as well as to explore their biological (antibacterial and cytotoxic) properties, namely the expression of reactive oxygen species (ROS) in the exposure of cells and bacteria. Based on hydrothermal synthesis, the characterization of as-prepared 2D-nanostructures was …
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· The influence of conditioning on the flotation of pyrrhotite in the presence of chlorite was investigated through flotation tests, sedimentation tests, and X-ray photoelectron spectroscopy (XPS) analysis. The flotation results …
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· Abstract. The non-stoichiometric compounds of iron sulphide named pyrrhotite (Fe1−xS) are often associated with pyrite (FeS2) in sulphidic ores and their waste products. The factors affecting ...
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· The main mineral components of the three samples were identified by XRD (Empyrean, PANalytical, Holland) at room temperature of 27°C. The results showed that FeS 2 was the main component in the pyrite, accompanied by a small amount of silica (SiO 2), and Fe 7 S 8 was the main component in the pyrrhotite, accompanied by a small amount of FeS 2 and …
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Abstract The origin in rocks of the common iron sulphides, pyrrhotine, Fe1-xS and pyrite, FeS2 and their behaviour during geochemical processes is best considered using the simplified redox reaction: 2FeS ⇌ FeS2 + Fe2+ + 2e−. Thus pyrrhotine is more reduced than pyrite and is the stable iron sulphide formed from magmas except where relatively high oxygen fugacities result …
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Pyrrhotite-11C. This page is currently not sponsored. Click here to sponsor this page. Formula: Fe10S11. This formula is approximate. These "polytypes" of pyrrhotite are really polytypoids with formulae slightly different than FeS. Colour: brownish yellow.
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· 1. Introduction [2] It has been suggested that vast unmagnetized regions within and around giant impact basins on Mars [Acuña et al., 1999] were demagnetized due to a shock-induced phase change or magnetic transition in magnetic carriers in the crust [Hood et al., 2003; Rochette et al., 2003].Models of the decay of shock pressure with distance indicate that the …
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Pyrrhotite Group. Name: Named in 1847 by Ours-Pierre-Armand Petit-Dufrénoy from Greek πνρρός "pyrrhos", flame-colored. Pyrrhotite is found with pentlandite in basic igneous rocks, …
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· The pyrrhotite was then sieved. This sample contains equidimensional pyrrhotite grains in the 100–150 μm size range [Dekkers, 1988]. Samples "9–47" and "20–131" are pyrrhotite-bearing metamorphic rocks from Taiwan (C.-S. Horng, Metamorphic pyrrhotite as a tracer for denudation of orogenic belts, manuscript in preparation, 2012).
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Pyrrhotite. La pyrrhotite sur Wikipedia; La pyrrhotite est une espèce minérale composée de sulfure de fer, de formule Fe 1-xS, 0<x<, à structure type nickéline, dureté 3½-4½, de couleur jaune–bronze, noircissant à l'air. La pyrrhotite cristallise …
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· Pyrrhotite in concrete is a geohazard that has caused a societal crisis in Connecticut, impacting as many as 35,000 homes, condominiums, and municipal buildings. Homes are going into foreclosure and people are losing their life savings, as the costs to replace entire foundations can be greater than $200,000.
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Pyrrhotite dissolution can proceed through oxidative or nonoxidative reactions. Oxidative dissolution can be at least 10 3 times slower than nonoxidative reactions (Thomas et al., …
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