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pyrrhotite    
磁黄铁矿

磁黄铁矿

pyrrhotite
n 1: a brownish iron sulfide mineral (FeS) having weak magnetic
properties [synonym: {pyrrhotite}, {pyrrhotine}, {magnetic
pyrites}]


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  • Pyrrhotite - Wikipedia
    Pyrrhotite is a rather common trace constituent of mafic igneous rocks especially norites It occurs as segregation deposits in layered intrusions associated with pentlandite, chalcopyrite and other sulfides
  • Pyrrhotite and Crumbling Concrete - CT. gov
    Pyrrhotite weathering in the presence of moisture and air produces secondary minerals that expand, causing concrete to crack This compromises the structural integrity and accelerates degradation with the increased infiltration of water and air
  • USGS Publishes Map of Potential Pyrrhotite Occurrences
    Pyrrhotite, a mineral of concern for the construction industry, consists of iron and sulfur, and when exposed to water and air, it can break down to form secondary minerals that expand and crack concrete, causing concrete structures, like home foundations, to fail
  • Pyrrhotite: Physical properties, uses, composition - Geology. com
    Pyrrhotite is an iron sulfide mineral with magnetic properties that make it easy to identify It is sometimes a minor ore of nickel Specimens with well-formed crystals are popular with collectors
  • Pyrrhotite: Mineral information, data and localities. - mindat. org
    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 Mineral Data
    Pyrrhotite Comments: Lustrous sharp crystals of pyrrhotite to 3 5 cm in size with minor sphalerite and chalcopyrite Location: Nikolaevskiy mine, Dal'negors, Primorskiy Kray, Russia
  • Pyrrhotite | Magnetic Properties, Iron Sulfide, Crystal Structure . . .
    pyrrhotite, iron sulfide mineral (Fe 1–x S) in the niccolite group; in it, the ratio of iron to sulfur atoms is variable but is usually slightly less than one
  • PYRRHOTITE (Iron Sulfide) - Amethyst Galleries
    The bulk of this specimen is made up of several crystals of Pyrrhotite, the iron sulfide known for its slight magnetism The crystals have the classic brown-gold color, submetallic luster, and platy, hexagonal shape with basal terminations that Pyrrhotite so often has
  • The Mineral pyrrhotite - The Mineral and Gemstone Kingdom
    Detailed description, properties, and locality information guide about the mineral pyrrhotite
  • UNDERSTANDING PYRRHOTITE IN CONCRETE
    This article presents information surrounding the expansive reaction related to an iron-sulfide-containing aggregate called pyrrhotite Pyrrhotite is the suspected cause of concrete durability issues found in the northeast U S (Conn ), primarily used for residential foundations





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