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Nanophase magnetite and pyrrhotite in ALH84001 Martian ...
Pyrrhotite and magnetite formation: Pyrrhotite has been identified as a sulfide mineral in ALH84001 carbonate globules; and along with magnetite they form the magnetic carriers in the meteorite [7]. Pyrite is the major sulfide mineral in the meteorite. Pyrrhotite may have formed by the thermal decomposition of
التنغستن الرطب خام جهاز تصنيف الهيدروليكية
خام الحديد فصل آلة للبيع mineral iron sand magnetic separator for particle size less than 3mm magnetite, pyrrhotite, limonite and other materials, wet magnetic separation, but also for coal, nonmetallic minerals, building materials and other .
Pyrrhotite
A diamondshaped pyrrhotite crystal sticks edgewise out of a matrix of smaller pyrrhotites, galena crystals and coated quartz crystals. The pyrrhotite measures 3 cm, and is bright and brassy. Its form is quite unusual it IS hexagonal, but four of the sides are very long, while the other two are extremely short. x x
Pyrrhotite: Mineral information, data and localities.
Pyrrhotite is found with pentlandite in basic igneous rocks, veins, and metamorphic rocks. It is also often found with pyrite, marcasite, and magnetite. It has varying magnetic powers, depending on the number of Fe vacancies in the crystal structure.
Pyrrhotite Wikipedia
Pyrrhotite is an iron sulfide mineral with the formula Fe (1x) S (x = 0 to ). 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.
31. ROCK MAGNETIC PROPERTIES OF HYDROTHERMALLY .
pyrrhotite, magnetite, and minor amounts of sphalerite and chalcopyrite. Magnetite together with two types of pyrrhotite determines the magnetic properties of these rock samples. The first type of pyrrhotite is ferrimagnetic up to 320°C. Xray diffraction data are in good agreement with those for monoclinic pyrrhotite.
How do pyrite and pyrrhotite damage building foundations ...
It is magnetite, rather than pyrrhotite, that is rare to occur in the actual active geothermal systems (BROWNE, 1978). For magnetite to be stable in a solution under a Pr condition, the Cn,s i" me solution must be lower than that in the PPMW system under the same P .
Pyrrhotite: The mineral pyrrhotite information and pictures
Pyrrhotite is commonly pseudomorphed by Pyrite, with complete replacement of the Pyrhottite by sparkling Pyrite crystals. Pyrrhotite is named from the Greek word pyrrhos, which means "color of fire".This is despite the fact that the usual color of Pyrrhotite is a bronze color rather than red; however its tarnish may have hints of sparkling red.
Magnetic susceptibility of geologic materials
Banded magnetite or pyrrhotite are the most significant examples of rocks with anisotropic susceptibility. Magnetite is, by far, the most significant contributor to a rock's magnetic properties. There are several empirical relations between magnetite content and bulk susceptibility.
Pyrrhotite Oxidation Pyrometallurgy: Roasting, Smelting ...
Heating Pyrrhotite at 320 degrees C. will destroy its magnetism. Heating in the presence of Oxygen (no water) will have the following reaction equation (balanced) ; 3FeS + 5O2 = Fe3O4 + 3SO2. This is the process that used to be used at INCO in Sudbury, Ontario, Canada to convert FeS to Magnetite, which was then pelletized and sold as Iron Ore.
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