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 …
Pyrrhotite and Crumbling Concrete - CT.gov
2020年5月27日 · 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
2020年4月29日 · 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.
How do pyrite and pyrrhotite damage building foundations?
Pyrite and pyrrhotite are minerals known as iron sulfides. When iron sulfides are exposed to water and oxygen, a series of chemical reactions breaks down the iron sulfides and forms new minerals called sulfates. These sulfates take up more space than the original iron sulfides.
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: 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 | 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
Pyrrhotite - an overview | ScienceDirect Topics
Pyrrhotite is a type of Fe-S mineral commonly found in base metal sulfide deposits. It has a significant impact on the recovery of valuable metals and must be removed during the beneficiation process. Pyrrhotite can have different structures, such as monoclinic and hexagonal, with different magnetic properties.
The Mineral pyrrhotite - The Mineral and Gemstone Kingdom
Pyrrhotite is an ore of iron. Well crystallized Pyrrhotite specimens are important collectors minerals. The aesthetic prismatic crystal forms are especially treasured by collectors and in high demand.
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