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- Pyrrhotite - Wikipedia
Pyrrhotite (pyrrhos in Greek meaning "flame-coloured") is an iron sulfide mineral with the formula Fe (1−x) S (x = 0 to 0 125) 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
- 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: 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: Physical properties, uses, composition - Geology. com
Pyrrhotite is an iron sulfide mineral found in igneous and metamorphic rocks Its chemical formula of Fe (1-x) S indicates that it is deficient in iron - which causes pyrrhotite to be slightly to strongly magnetic After magnetite, pyrrhotite is the second-most-common magnetic mineral What Is Pyrrhotite?
- 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 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 Scale: 4 x 5 x 5 5 cm © Dan Weinrich
- UNDERSTANDING PYRRHOTITE IN CONCRETE
Pyrrhotite is the suspected cause of concrete durability issues found in the northeast U S (Conn ), primarily used for residential foundations The foundations of interest are experiencing a slow crack development, resulting in the eventual loss of concrete strength
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