How To Use Pyrrhotite In A Sentence
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Many conclude that because pyrite is cubic, pyrrhotite must be hexagonal, as it often appears.
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The most common ores of nickel are pentlandite, pyrrhotite, and garnierite.
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Pseudomorphs of marcasite, chalcopyrite, pyrite, arsenopyrite, pyrargyrite, magnetite, and quartz after pyrrhotite have been reported.
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Some pyrrhotite is relatively unstable in humid environments, decrepitating like pyrite.
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(particularly pentlandite, but also millerite, niccolite, and others), which are found at Sudbury intergrown with the iron and copper sulphides, pyrrhotite and chalcopyrite; and the hydrated nickel-magnesium silicates (garnierite and genthite), which are products of weathering.
The Economic Aspect of Geology
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We have also seen several specimens in which pyrite has replaced a hexagonal mineral that was probably pyrrhotite.
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Sulphide mineralization in these deposits tends to be disseminated throughout the body and is dominated by pyrrhotite and pentlandite phases.
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Secondary titanite, chlorite, white mica and pyrrhotite are abundant, and some samples contain metamorphic biotite.
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Other minerals mentioned from the mine by Dunham include galena, sphalerite, pyrite, chalcedony, and minor marcasite and pyrrhotite.
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In essence, the researchers hold that the combination of magnetite, pyrrhotite, and carbonate could not have formed nonbiologically.
The Case for Mars
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Whereas monoclinic pyrrhotite is ferrimagnetic, the hexagonal variety is antiferromagnetic.
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Microcrystals of pyrrhotite, goethite, pyrite, galena, and calcite are found on the dumps.
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We have not yet found any unaltered material to verify that the original mineral was pyrrhotite, as claimed by Brush.
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Preliminary assessment suggests the mineralogy is mainly pentlandite + pyrrhotite.
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This rock is a dark gray schistose rock containing radiating aggregates of cummingtonite and occasionally pyrrhotite.
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Whereas monoclinic pyrrhotite is ferrimagnetic, the hexagonal variety is antiferromagnetic.
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Nickel sulphide ores containing pentlandite, pyrrhotite and talc have traditionally been treated by bulk sulphide flotation, an approach which seeks to maximise nickel recovery and talc rejection but which does not reject pyrrhotite.
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The most common ores of nickel are pentlandite, pyrrhotite, and garnierite.
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(particularly pentlandite, but also millerite, niccolite, and others), which are found at Sudbury intergrown with the iron and copper sulphides, pyrrhotite and chalcopyrite; and the hydrated nickel-magnesium silicates (garnierite and genthite), which are products of weathering.
The Economic Aspect of Geology
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Mineralization consists of quartz-albite-calcite veining with disseminated pyrite, pyrrhotite and arsenopyrite hosted in pervasively silicified, brecciated siltstone and wacke.
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Many conclude that because pyrite is cubic, pyrrhotite must be hexagonal, as it often appears.
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Nickel is found in many ores as sulfides, arsenides, antimonides & oxides or silicates; chief sources include chalcopyrite; others are pyrrhotite, pentlandite, garnierite, niccolite, millerite.
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The 20 vein is comprised of an assemblage of semi-massive irregular clusters of sulphide chalcopyrite, pyrrhotite, pyrite, and minor tetrahedrite.
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Other minerals mentioned from the mine by Dunham include galena, sphalerite, pyrite, chalcedony, and minor marcasite and pyrrhotite.
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Iron and copper sulfides of this region are predominately pyrite, pyrrhotite, chalcopyrite, arsenopyrite, bornite, and marcasite.
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Other sulfides, including pyrite, marcasite, chalcopyrite, and pyrrhotite, are occasionally found as well.
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Lustrous pyrrhotite crystals on quartz and wolframite were recovered at one time from the ‘Cables’ section of the Chicote Grande mine, Bolivia.
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Pseudomorphs of marcasite, chalcopyrite, pyrite, arsenopyrite, pyrargyrite, magnetite, and quartz after pyrrhotite have been reported.
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Sulphide mineralization in these deposits tends to be disseminated throughout the body and is dominated by pyrrhotite and pentlandite phases.
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In addition to the enstatite, forsterite, and PAHs, they are trying to model their spectra using a library containing dolomite (a carbonate), smectite (a clay), spinel/hibonite, pyrrhotite, iron oxide, and elemental carbon grains.
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Iron and copper sulfides of this region are predominately pyrite, pyrrhotite, chalcopyrite, arsenopyrite, bornite, and marcasite.
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The effects of organic depressant DMPS on jamesonite and pyrrhotite have been studied.
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The skarns also contain hornblende, calcite, pyroxene, tremolite, pyrrhotite, molybdenite, galena, chalcopyrite, arsenopyrite, garnet (probably andradite or grossular), and pyrite.
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Nickel comes from the minerals pyrrhotite, pentlandite and garnierite.
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Secondary titanite, chlorite, white mica and pyrrhotite are abundant, and some samples contain metamorphic biotite.
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Only 7% of the analysed specimens contain monoclinic pyrrhotite, which can contribute to the total remanent magnetization of the rocks.
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Secondary titanite, chlorite, white mica and pyrrhotite are abundant, and some samples contain metamorphic biotite.
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The central and western United States have a similarly diverse array of pyrrhotite occurrences.