Pyrrhotite phase relation below 304

Arnold, R.

doi:10.2113/gsecongeo.64.4.405

Cited by 39 publications

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“…In the case where the final composition of hexagonal pyrrhotite lies between 47.4 and 46.67 atomic percent iron (Arnold, 1967;Yund and Hall, 1969), it will exsolve mpo as temperature drops rapidly across the upper boundary of the mpo+hpo two-phase field. Mpo actually exsolving from hexagonal grains has been observed in experiments (Von Gehlen, 1963;Arnold, 1969). Arnold (1969) also provided a series of photomicrographs of the products of his experiments.…”

Section: Origin Of Lamellar Intergrowthsmentioning

confidence: 84%

“…Mpo actually exsolving from hexagonal grains has been observed in experiments (Von Gehlen, 1963;Arnold, 1969). Arnold (1969) also provided a series of photomicrographs of the products of his experiments. The exsolved monoclinic phase in Arnold's experiments is crystallographically oriented within its hexagonal host.…”

Section: Origin Of Lamellar Intergrowthsmentioning

confidence: 84%

“…SINCE monoclinic pyrrhotite, FeTSs, was first recognized by Bystr(im (1945), much research has been carried out on hexagonal and monoclinic pyrrhotites (hpo and mpo) in terms of their composition, structure, physical properties and intergrowth (Carpenter and Desborough, 1964;Arnold, 1967;Yund and Hall, 1969;Bennett et al, 1972) their stability and equilibrium relations to each other and to other iron sulphides (Arnold, 1962(Arnold, , 1969Toulmin and Barton, 1964;Desborough and Carpenter, 1965;Clark, 1966;Yund and Hall, 1970;Kissin and Scott, 1982;Lusk et al, 1993) and their occurrence in ore deposits (Vaughan et al, 1971;Carpenter, 1974;Zhang Zhengen et al, 1976;K0bler and Lindqvist, 1979;Gu et al, 1988Gu et al, , 1993. In Norway, however, little work has been published *Present address: Department of Earth Sciences, Nanjing University, Nanjing 210008, P.R.…”

Section: Introductionmentioning

confidence: 99%

“…In spite of the fact that various superstructures have been found for the pyrrhotite group (Desborough and Carpenter, 1965;Morimoto, 1970, 1971), we have chosen to adopt the traditional classification of these iron monosulphides, except troilite, into the two general varieties of monoclinic and hexagonal (Arnold, 1962(Arnold, , 1967(Arnold, , 1969Yund and Hall, 1969;Vaughan and Craig, 1978) in order to fit the magnetic colloid method (see Craig and Vaughan, 1981) used in this work.…”

Section: Introductionmentioning

confidence: 99%

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Intergrowths of hexagonal and monoclinic pyrrhotites in some sulphide ores from norway

Vokes²

1996

Mineral. mag.

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Pyrrhotites in polished sections from more than twenty stratabound massive sulphide and magmatic nickelcopper deposits in Norway were studied under the microscope using the magnetic colloid method. In both types of deposits, two distinct styles of intergrowths between monoclinic and hexagonal pyrrhotites were found: crystallographically-controlled lamellar intergrowths and fissure-controlled irregular intergrowths.Lamellar intergrowths consist of crystallographically oriented monoclinic lamellae occurring in a hexagonal matrix and were produced originally by exsolution from hexagonal pyrrhotite on cooling. Irregular intergrowths comprise blades and patches of monoclinic pyrrhotite occurring along fissures and grain boundaries of hexagonal pyrrhotite, and were formed by interactions between hexagonal grains and sulphurrich hydrothermal solutions.Increase in lamella thickness and spacing, development of lamella zonations, wedge-shaped composite ends, boxworks and composite lamellae were caused by progressive lamellae coarsening and maturation during natural annealing, which could have been promoted by anisotropic stress. Metamorphic recrystallization and annealing tend to homogenize pyrrhotite and erase preexisting exsolution lamellae.

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Section: Origin Of Lamellar Intergrowthsmentioning

confidence: 84%

Section: Origin Of Lamellar Intergrowthsmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Intergrowths of hexagonal and monoclinic pyrrhotites in some sulphide ores from norway

Vokes²

1996

Mineral. mag.

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“…Inversement, la raret6 de la pyrrhotite monoclinique dans l'aur6ole interne et dans les skarns ~ scheelite s'explique par des conditions de refroidissement assez brutales qui n'auraient pas permis la transformation de la pyrrhotite hexagonale en pyrrhotite monoclinique. Nous savons en effet (Gronvold et Haraldsen 1952, Arnold 1969) que cette transformation ne s'op6re qu'en dessous de 250°C.…”

Section: Les Sphaldrites Situ~es Dans Un Mome Niveau Stratigraphique unclassified

Etude des min�ralisations sulfur�es du gisement de Salau, Pyren�es (France) et de ses environs

Derré

Lafitte²,

Maury³

1984

Mineral. Deposita

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R~sum& Les min6ralisations du gisement de Salau, Pyrdndes (France) comportent, outre la pyrrhotite et la scheelite, de la chalcopyrite, de l'arsdnopyrite et de la sphal6rite en phases accessoires. Ces sulfures ont 6t6 analys6s /t la microsonde 61ectronique. -Les pyrrhotites sont les seuls sulfures ~ avoir subi l'influence de la raise en place de la rhyodacite. Les autres sulfures pr6sentent une grande homog6n6it6 et n'ont pas subi de modification li6e /~ la raise en place du pluton. Les teneurs en fer des sphal6rites, homog6nes /t l'int6rieur d'un m~me niveau stratigraphique, mais diff6rentes d'un niveau fi l'autre, sugg6rent une mise en place /~ plusieurs p6riodes sans remaniement ult6rieur/~ leur ddp6t. Abstract. Mineralisation of Salau deposit, Pyr6n6es(France) contain massive pyrrhotite and scheelite associated with chalcopyrite, arsenopyrite and sphalerite. Electron microprobe analyses of these sulfides have been systematically performed. -Pyrrhotites show a zonation with regard to the rhyodacite settlement. Other sulfides show a great homogeneity and are not disturbed by this settlement. Iron content of sphalerites, homogeneous inside a given stratigraphical level but different when the age of layers change, suggest several origins without further modification.

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A review of the physicochemical properties and flotation of pyrrhotite superstructures (4C – Fe₇S₈/ 5C – Fe₉S₁₀) in Ni‐Cu sulphide mineral processing

Multani

Waters

2018

Can J Chem Eng

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Pyrrhotite is one of the most abundant sulphide gangue minerals in base metal mining operations. It has little economic value and is a significant contributor of SO2 emissions at the smelting stage, thus it is rejected in most concentrators, requiring a concerted effort to ensure it is well separated from valuable minerals. The mineral processing of pyrrhotite is generally understood, however it has many complex crystallographic structures (superstructures) that behave differently in the flotation pulp for which the information is sparse and dispersed throughout the literature. Traditionally, the superstructures were largely isolated into magnetic/non–magnetic circuits and floated separately. Many operations have now transitioned away from magnetic separators, and treat the superstructures in the same flotation circuit where their flotation responses are quite different. Historically, it was perceived that the superstructures behaved virtually the same; whereas, recent work has clearly demonstrated that there are quantifiable differences in their flotation responses. The available information is scattered in the literature and is also plagued with many contradictions, making it very difficult for researchers to retrieve relevant information pertaining to the superstructures. This review aims to reduce the confusion by summarizing the superstructure nomenclature, characterization methods, aqueous stability, surface charges and superstructure‐reagent interactions, and available flotation data.

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Pyrrhotite phase relation below 304

Cited by 39 publications

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Intergrowths of hexagonal and monoclinic pyrrhotites in some sulphide ores from norway

Intergrowths of hexagonal and monoclinic pyrrhotites in some sulphide ores from norway

Etude des min�ralisations sulfur�es du gisement de Salau, Pyren�es (France) et de ses environs

A review of the physicochemical properties and flotation of pyrrhotite superstructures (4C – Fe₇S₈/ 5C – Fe₉S₁₀) in Ni‐Cu sulphide mineral processing

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Pyrrhotite phase relation below 304

Cited by 39 publications

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Intergrowths of hexagonal and monoclinic pyrrhotites in some sulphide ores from norway

Intergrowths of hexagonal and monoclinic pyrrhotites in some sulphide ores from norway

Etude des min�ralisations sulfur�es du gisement de Salau, Pyren�es (France) et de ses environs

A review of the physicochemical properties and flotation of pyrrhotite superstructures (4C – Fe7S8/ 5C – Fe9S10) in Ni‐Cu sulphide mineral processing

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A review of the physicochemical properties and flotation of pyrrhotite superstructures (4C – Fe₇S₈/ 5C – Fe₉S₁₀) in Ni‐Cu sulphide mineral processing