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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.
2014 article with extensive technical detail on how pyrrhotite causes damage to concrete, including a number of real-world examples. 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.
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.
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 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.
Monoclinic. Member of: Pyrrhotite Group. Name: Named in 1847 by Ours-Pierre-Armand Petit-Dufrénoy from Greek πνρρός "pyrrhos", flame-colored. Pyrrhotite is found with pentlandite in basic igneous rocks, veins, and metamorphic rocks. It is also often found with pyrite, marcasite, and magnetite.
Environment: Wide spread occurrences in igneous and metamorphic rocks. IMA Status: Valid Species (Pre-IMA) 1835. Locality: Sudbury, Ontario, Canada and Santa Eulalia, Chihuahua, Mexico. Link to MinDat.org Location Data. Name Origin: From the Greek, phrrhotes, "redness," in allusion to color.
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.
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.
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.