PYRRHOTITE

pĭrˈətīt or magnetic pyrites, bronze-yellow to bronze-red mineral, a sulfide of iron sometimes containing nickel. It tarnishes easily and is somewhat magnetic. It crystallizes in the hexagonal system, but appears usually in massive form, and occurs chiefly in basic igneous rocks. In some areas, e.g., at Sudbury, Ont., Canada, it is associated with pentlandite, an important ore of nickel. It is found also in the United States, Europe, and South America.

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The Columbia Encyclopedia, Sixth Edition Copyright© 2004, Columbia University Press. Licensed from Lernout & Hauspie Speech Products N.V. All rights reserved.

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Questia Books and Articles on: Pyrrhotite
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books on: Pyrrhotite  - 25 results

       More book Results: 1-10 11-20 21-25 >>  
 
1.
Rock Magnetism
Book by Takesi Nagata; Maruzen Co., 1961
Subjects: Rocks--Magnetic Properties
...markedly with the temperature. 12. Pyrrhotite, FeS 1+x Several iron sulphide minerals: i.e. troilite FeS , pyrrhotite FeS 1+x , pyrite FeS 2 and markasite...natural state. Of these minerals pyrrhotite alone is ferrimagnetic and has been...
2.
Application of Geology to Engineering Practice: Berkey Volume
Book by Sidney Paige; 1950
Subjects: Berkey, Charles Peter--B. 1867, Engineering Geology, Geology
...Montana; and in the several detached pyrrhotite-chalcopyrite-bearing ore shoots...with varying amounts of magnetite, pyrrhotite, and pyrite. The gold occurs principally...pyrite and to a lesser extent in the pyrrhotite within the metamorphosed rocks along...
3.
Principles of Field and Mining Geology
Book by James Donald Forrester; J. Wiley & Sons, Inc., 1946
Subjects: Geology--Field Work, Mining Geology
...interpretable results. 2. Surveys of Pyrrhotite Deposits and Nonmagnetic Ores Associated with Magnetite or Pyrrhotite. In addition to the test at Sudbury...associated with basic dikes, flat lying pyrrhotite bodies containing cassiterite, and...
4.
Interpretation of Aeromagnetic Maps
Book by V. Vacquier, Nelson Clarence Steenland, Roland G. Henderson, Isidore Zietz; Geological Society of America, 1958
Subjects: Cartography, Geomagnetism--Maps, Geomagnetism--United States--Maps
...Mineral Susceptibility e.m.c.g.s. per cm. 3 Field strength Oersted Magnetite .3 to .8 .6 Pyrrhotite Sudbury, Ont .028 .6 Pyrrhotite .007 - Ilmenite .031 - Ilmenite .044 .6 Specularite .044 .6 Specularite .003 -- Franklinite...
5.
Sciences in Communist China: A Symposium Presented at the New York Meeting of the American Association for the Advancement of Science, December 26-27, 1960
Book by Sidney H. Gould; American Association for the Advancement of Science, 1961
Subjects: Science--History--China--Congresses
...and low-grade pyrite for making sulfuric acid and byproduct iron concentrate. Investigations in fluosolid roasting of pyrrhotite show that a 10% S material can have natural combustion at 850 C and yield an 8-10?% SO 2 gas; larger grain sizes which...
More book Results: 1-10 11-20 21-25 >>

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journal articles on: Pyrrhotite  - 29 results

       More journal Results: 1-10 11-20 21-29 >>  
 
1.
Mineralogy, Sulphur Isotope Geochemistry and the Development of Sulphide Structures at the Broken Spur Hydrothermal Vent Site, 29 Degrees 10'n, Mid-atlantic Ridge
Journal article by I. B. Butler, A. E. Fallick, R. W. Nesbitt; Journal of the Geological Society, Vol. 155, 1998
Subjects: Chemistry, Geology, Isotopes, Mineralogy
...BRAVEX sample suite is major marcasite, pyrrhotite, and sphalerite, abundant chalcopyrite...pyrite, chalcopyrite and trace boxwork pyrrhotite. The outer walls of the structures...porosity) friable assemblage of major pyrrhotite with abundant sphalerite and minor chalcopyrite...
2.
Anticlockwise and Clockwise Rotations of the Eastern Variscides Accommodated by Dextral Lithospheric Wrenching: Palaeomagnetic and Structural Evidence
Journal article by J. B. Edel, K. Schulmann, F. V. Holub; Journal of the Geological Society, Vol. 160, 2003
Subjects: Carbon dating, Geography, Geological time, Plate tectonics
...unblocking temperatures mainly consist of pyrrhotite, and rarely of Ti-magnetite or maghemite...some cases, they are all carried by pyrrhotite and correspond to successive partial...opposite magnetizations are respectively pyrrhotite and partly oxidized pyrrhotite (CBP12...
3.
New Palaeomagnetic Results from the Whin Sill Complex: Evidence for a Multiple Intrusion Event and Revised Virtual Geomagnetic Poles for the Late Carboniferous for the British Isles
Journal article by D. Liss, W. H. Owens, D. H. W Hutton; Journal of the Geological Society, Vol. 161, 2004
Subjects: British Isles, Dams, Geology, Igneous rock
...of sulphides are present. Pyrrhotite is the most commonly occurring...hexagonal variety, as monoclinic pyrrhotite does not possess this basal...Microprobe analyses on pyrrhotites in the dolerites of the Whin...1981). Whereas monoclinic pyrrhotite is ferrimagnetic, the hexagonal...
4.
A Mid-archaean Island Arc Complex in the Eastern Akia Terrane, Godthåbsfjord, Southern West Greenland
Journal article by Adam A. Garde; Journal of the Geological Society, Vol. 164, 2007
Subjects: Geology, Plate tectonics, Stratigraphy
...cent fine-grained, disseminated pyrrhotite in textural equilibrium with the silicate assemblages. The pyrrhotite-bearing horizons are conformable...andalusite, may occur adjacent to the pyrrhotite-bearing horizons. These rocks are...
5.
Cyclostratigraphy, Orbital Tuning and Inferred Productivity for the Type Kimmeridge Clay (Late Jurassic), Southern England
Journal article by Graham P. Weedon, Angela L. Coe, Ramues W. Gallois; Journal of the Geological Society, Vol. 161, 2004
Subjects: Carbon, England, Fossils, Geological time, Rocks, Sea level, Sedimentation & deposition
...ferroan calcite, dolomite, and possibly pyrrhotite (FeS-Fe^sub 0.8^S) and iron...sulphate reduction after the formation of pyrrhotite. However, pyrite is very weakly paramagnetic...probably because of the presence of pyrrhotite and/or remnant iron oxides, although...
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encyclopedia articles on: Pyrrhotite  - 5 results

 
 
1.
Pyrrhotite
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
PYRRHOTITE pir tit or magnetic pyrites, bronze-yellow to bronze-red mineral, a sulfide of iron sometimes containing nickel. It tarnishes...
2.
Magnetic Pyrite
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
MAGNETIC PYRITE see pyrrhotite . ____________________ Copyright 2009 Columbia University Press. Used with the permission of Columbia University Press. All rights reserved.
3.
Nickel
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...and cobalt used structurally in jet engines. Nickel occurs in a number of minerals; its chief ores are pentlandite and pyrrhotite (nickel-iron sulfides) and garnierite (nickel-magnesium silicate). Nickel is present in most meteorites. It is also...
4.
Pentlandite
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...a sulfide of iron and nickel, (Fe,Ni) 9 S 8 . It is found in masses nearly always associated with the iron sulfide pyrrhotite. The largest deposit of this important ore of nickel is at Sudbury, Ont. Important deposits are mined in Manitoba, Russia...
5.
Pyrite
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...composition are arsenopyrite , chalcopyrite (copper pyrites), cobaltite , marcasite (white iron pyrites or spear pyrites), and pyrrhotite (magnetic pyrites). ____________________ Copyright 2009 Columbia University Press. Used with the permission...


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