Pyrrhotite can be grouped into two categories, depending on the constituent superstructures: commensurate pyrrhotites with integer values of N and incommensurate (or intermediate) pyrrhotites with non-integer values. The chemical formulas of commensurate NC superstructures take the form Fe n–1 S n (n ≥ 8), where N = n/2 for n = even and N = …Web
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Monoclinic pyrrhotite, however, in contrast to hexagonal pyrrhotite, is magnetic and is recovered in magnetic concentrates. Previous research (Cline and Rosas, 1975; Iwasaki, 1999) has shown that flotation can be used to remove pyrrhotite. The Marcona Mine in Peru uses a reverse flotation process to float pyrrhotite from the magnetite.Web
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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 ...Web
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The minerals pyrrhotite, pentlandite, pyrite, chalcopyrite, ilmenite, magnetite, and violarite (a secondary oxidation mineral of pentlandite) were identified. Samples of violarite are reported to contain up to 30.7 weight percent nickel (Craig and Higgins, 1975). Geochemical surveys were performed at the Lick Fork and Vest prospects.Web
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Pyrrhotite is commonly pseudomorphed by Pyrite, with complete replacement of the Pyrhottite by sparkling Pyrite crystals. Pyrrhotite is named from the Greek word pyrrhos, …Web
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The culprit is pyrrhotite, which occurs in construction aggregate (crushed stone) that was used as a filler in concrete. When pyrrhotite is naturally exposed to water and oxygen, it …Web
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Pyrite has been used for various purposes throughout history due to its unique properties. Some of the main uses of pyrite include: Jewelry and Decorative Items: Pyrite's brassy-yellow to pale-gold color …Web
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Pyrrhotite (pyrrhos in Greek meaning "flame-coloured") is an iron sulfide mineral with the formula Fe (1-x) S (x = 0 to 0.2). It is a nonstoichiometric variant of FeS, the mineral known as troilite.Pyrrhotite is also called magnetic pyrite, because the color is similar to pyrite and it is weakly magnetic.The magnetism decreases as the iron content decreases, and …Web
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Also known as pyrrohotite. Streak: grayish black. Other Tests: Magnetic, varying in intensity, lost on heating. Decomposed by HCl. Occurrence: Associated with pyrite and other sulfides throughout the world, often as a …Web
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The best parts of the ore with 3000–5000 ppm Ni are always dominated by pyrrhotite, and in these parts, nearly all Ni is located in pyrrhotite ± pentlandite. Solid-state mobility of mss has taken place in a cm–dm scale, generating blebby and veiny pyrrhotite ± pentlandite (see Fig. 9.1.7C) in structurally reworked parts of the deposit ...Web
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Uses of Sphalerite. For industrial purposes, sphalerite is used in galvanized iron, brass and batteries. The mineral is also used as a mildew-resistant element in certain paints. When polished, sphalerite can vary in color from fiery red to gold-orange to a distinctive green-yellow color and also has a stunning light dispersion factor of 0.156.Web
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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 …Web
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Uses: A historical source of sulfur. Some gemstones and jewelry items are reported to be made of marcasite, but most of these are actually pyrite or made from a metal with a similar appearance. ... Hydrothermal marcasite is often associated with pyrite, pyrrhotite, galena, sphalerite, fluorite, dolomite, or calcite. The best way to learn about ...Web
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This chapter describes Pyrrhotite (abbrv. po), as seen with optical, reflected light microscopy. After summing up compositional data, main properties and optical …Web
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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. The hardness varies between 3.5 and 4.5 on the Mohs scale and an average specific gravity of 4.6.Web
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Pyrrhotite (Fe1-xS, where x = 0 – 0.2) is a common sulfide mineral exhibiting a brownish-bronze color with a metallic luster. Physical properties include a hardness of 4 on the Mohs scale, a specific gravity ranging between 4.58 and 4.65 and is magnetic, but with varying intensity depending upon the iron content.Web
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The ISS will decompose to 58% chalcopyrite, 31% pyrrhotite and 10% pentlandite and the MSS will decompose to 54% pentlandite, 28.5% pyrrhotite, 17% pyrite and 0.5% chalcopyrite (because pyrrhotite also accommodates some Ni, its percentage could increase on expense of pentlandite).Web
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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 pyrite and ...Web
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12 rowsUses of Pyrrhotite. Pyrrhotite is often intergrown with pentlandite (Fe,Ni) 9 S 8, the ...Web
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Pyrrhotite is the suspected cause of concrete durability issues found in the northeast U.S. (Conn.), primarily used for residential foundations. The foundations of interest are experiencing a slow crack development, resulting in the eventual loss of concrete strength. The problems, sometimes exhibiting themselves within the first 10 years ...Web
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Pyrrhotite is an iron sulfide mineral with variable composition and its formula is usually given as Fe(1-x) S, where "x" represents vacancies in the Fe sites. For example, if x = 0.1, then the formula for pyrrhotite is Fe 9 S 10. The greater the Fe vacancies, the more unstable is the pyrrhotite, and the greater the tendency to oxidation.Web
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Pyrrhotite displays various superstructures based on a NiAs structure (Table 1), which is due to the ordered Fe vacancies in its nonstoichiometric composition, with an average Fe–S distance of 2.50 Å (Belzile et al. 2004; Wang and Salveson 2005).Pyrrhotite has two basic subgroups: the hexagonal pyrrhotite, which tends to be iron-rich (in the …Web
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The mineral sequence and LA-ICP-MS study of the trace-elements distribution in chalcogenides (arsenopyrite, pyrite, pyrrhotite, sphalerite, chalcopyrite, ullmannite, tetrahedrite, berthierite, stibnite, gudmundite, jamesonite) of the Olympiada gold ore deposit (Yenisei Ridge, Russia) are presented. The deposit was formed in three stages ...Web
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When pyrrhotite is naturally exposed to water and oxygen, it breaks down to produce sulfuric acid and secondary minerals, including gypsum, which have larger volumes than the pyrrhotite they replace. The expanded volume of the secondary minerals cracks and degrades concrete.Pyrrhotite occurs in rocks in many areas of the United States. To …Web
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It purges the mind of uncertain thoughts. It's good for the memory. It makes learning easier, increases self-confidence. It's good for the heart and circulatory system. It reduces vascular congestion. Increases rate of oxygen in the blood. It benefits blood diseases. Pyrite stone protects against infectious diseases.Web
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The galvanic interaction between chalcopyrite and monoclinic pyrrhotite and its effect on flotation separation were studied using monomineral flotation tests, adsorption capacity tests, X-ray photoelectron spectroscopy (XPS) characterization, and scanning electron microscopy (SEM) test. These results showed that the interaction …Web
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Pyrrhotite Fe1−xS (x = 0 to 0.17) c 2001-2005 Mineral Data Publishing, version 1 Crystal Data: Monoclinic, pseudohexagonal. Point Group: 2/m. Crystals typically tabular or platy on {0001}, to 40 cm; steep pyramidal faces or short pyramidal; as rosettes showing nearly parallel aggregation on {0001}; commonly massive, granular. Twinning: On {1012}.Web
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The microbially mediated recovery of valuable metals contained in mining waste presents an economical alternative to conventional hydrometallurgical processes. In order to investigate the effect of bacterial adaptation and biological oxidation on bioleaching, the microbially mediated bioleaching of a pyrrhotite sample from mine …Web
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Decomposed by HCl. Occurrence: Associated with pyrite and other sulfides throughout the world, often as a magmatic segregation in basic igneous rocks. Occasionally in pegmatites and contact metamorphic rocks, …Web
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Pyrrhotite in pyritic ores has often been attributed to the breakdown of pyrite during metamorphism. It is now clear that pyrrhotite can be primary and that the presence of pyrrhotite with the pyrite provides a buffer that constrains sulphur activity during metamorphism. Pyrite-pyrrhotite ratios change during metamorphism as prograde …Web
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Uses: The primary ore of arsenic metal. Arsenic is toxic to many organisms, and that is its role in insecticides, herbicides, pesticides, chemical weapons, and other poisons. ... It is often intergrown with other sulfide minerals such as chalcopyrite, galena, pyrrhotite, pyrite, and sphalerite; precious metals such as gold and silver; or other ...Web
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Pyrrhotite is a complex mineral with varying chemical composition, crystallographic structure, and specific surface area. These factors influence the reactivity of pyrrhotite.Web
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