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Electron Imaging of Pyrrhotite Superstructures
Science, 1974Natural pyrrhotites, when studied by high resolution electron microscopy, yield crystallographic information on a unit cell scale. Structural heterogeneity is prominent. The many reported superstructures are interpretable through an antiphase model.
L, Pierce, P R, Buseck
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Crystallography and stability of pyrrhotites
Economic Geology, 1975Crystals of pyrrhotite from nine localities of different geological conditions have been examined by the reflection microscope and X-rays. The results indicate abundant and wide occurrence of three different pyrrhotites, 4C, nC (intermediate pyrrhotites), and 2C (troilite).
N. Morimoto +3 more
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Hydrometallurgical processing of pyrrhotite
Canadian Metallurgical Quarterly, 1972AbstractExploitation of pyritic ores would be facilitated by a process yielding elemental sulphur instead of sulphuric acid. Thermal decomposition permits the recovery of nearly half the sulphur as the element. For the recovery of iron, non-ferrous metals and remaining sulphur from the “artificial pyrrhotite” several hydrometallurgical methods have ...
K.N. Subramanian +2 more
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Solid State Communications, 1970
Mössbauer spectra of natural monoclinic pyrrhotite (Fe7S8) have been determined at 300, 77 and 4.2°K and interpreted using a least squares fit computer programme. The spectrum at 77°K was resolved into five components. Four have a finite hyperfine field and one has zero hyperfine field gradient. The parameters obtained from the fit agree with the model
Vaughan, D. J., Ridout, M. S.
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Mössbauer spectra of natural monoclinic pyrrhotite (Fe7S8) have been determined at 300, 77 and 4.2°K and interpreted using a least squares fit computer programme. The spectrum at 77°K was resolved into five components. Four have a finite hyperfine field and one has zero hyperfine field gradient. The parameters obtained from the fit agree with the model
Vaughan, D. J., Ridout, M. S.
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A discussion of pyrrhotite fabrics
Canadian Journal of Earth Sciences, 1987The classification of pyrrhotite fabrics proposed by Lusk and Ostwald identifies E-type pyrrhotite, which has no dimensional or crystallographic preferred orientation and an equant grain shape, and F-type pyrrhotite, which has a distinct dimensional and crystallographic preferred orientation and flattened, elongate grain shapes.
Sandra Simigian, John Starkey
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Effect of pyrrhotite reactivity on cyanidation of pyrrhotite produced by pyrolysis of a sulphide ore
Minerals Engineering, 1998Abstract The effect of the metal to sulphur ratio in the nonstoichiometic compound, pyrrhotite, is related to the consumption of cyanide in gold leaching. Reactive pyrrhotite (Fe (I-X) S) is produced during the pyrolysis of refractory pyrite (FeS 2 ).
R.E. Browner, K.H. Lee
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Mössbauer Investigations on Pyrrhotite
Physica Status Solidi (a), 1984An experimental study of the vacancy distribution in pyrrhotite (Fe1–xS) is presented. Seven samples from various deposits in India are investigated using Mossbauer spectroscopy, X-ray diffraction, and thermo-magnetic analysis techniques and a partially ordered and partially random vacancy distribution model for intermediate pyrrhotite is discussed.
V. P. Gupta +3 more
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Kinetics of Oxidation of Pyrrhotite
2018Pyrrhotite is an iron deficient, low nickel content sulfide mineral that is commonly associated with pentlandite, a nickel-rich sulfide; and are both main components of the nickel ore mined in Sudbury. Pyrrhotite tailings generated in the concentration of Ni ores are stored in tailing reservoirs and presents serious environmental risks including acid ...
Anastasia Alksnis +3 more
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The Pyrrhotite 32 K Magnetic Transition
Solid State Phenomena, 2011Pyrrhotite [1] is a common ferrimagnetic mineral in terrestrial rocks and has been identified recently as the major remanence carrier in Martian rocks, as in SNC (Shergotty-Nakhla-Chassigny) type meteorites. This compound undergoes a low temperature magnetic transition around 32 K with a change in the natural magnetic remanence [2].
Wolfers, Pierre +4 more
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The Canadian Mineralogist, 2003
On peut determiner la nature des defauts ponctuels dans la pyrrhotite a partir des mesures de composition et de la fugacite du soufre correspondante en examinant les equilibres des reactions proposees impliquant le FeS parfaitement ordonne, les especes hypothetiques concues pour exprimer les defauts ponctuels, et le soufre, S 2 .
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On peut determiner la nature des defauts ponctuels dans la pyrrhotite a partir des mesures de composition et de la fugacite du soufre correspondante en examinant les equilibres des reactions proposees impliquant le FeS parfaitement ordonne, les especes hypothetiques concues pour exprimer les defauts ponctuels, et le soufre, S 2 .
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