Pyrrhotite - Wikipedia
WEBPyrrhotite (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 and Crumbling Concrete - CT.gov
WEBMay 27, 2020 · 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 …
USGS Publishes Map of Potential Pyrrhotite Occurrences
WEBApr 29, 2020 · 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?
WEB2014 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: Physical properties, uses, composition - Geology.com
WEBPyrrhotite 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.
WEBMonoclinic. 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.
Pyrrhotite: The mineral pyrrhotite information and pictures
WEBPyrrhotite 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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