• Pyrrhotite - Wikipedia

    en.wikipedia.org/wiki/Pyrrhotite Pyrrhotite is an iron sulfide mineral with the formula Fe (1-x) S (x = 0 to 0.2). 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.The magnetism decreases as the iron content increases, and troilite is non-magnetic. [page needed]
  • Pyrrhotite: Mineral information, data and localities.

    www.mindat.org/min-3328.html 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.
  • How do pyrite and pyrrhotite damage building foundations ...

    www.americangeosciences.org/.../how-do-pyrite-and-pyrrhotite-damage-building-... 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. As they grow, the new sulfate minerals push against the surrounding rock, causing it to swell and
  • Pyrrhotite | Definition of Pyrrhotite by Merriam-Webster

    www.merriam-webster.com/dictionary/pyrrhotite Pyrrhotite definition is - a bronze-colored mineral of metallic luster that consists of ferrous sulfide and is attracted by a magnet.
  • Pyrrhotite: The mineral pyrrhotite information and pictures

    www.minerals.net/mineral/pyrrhotite.aspx Pyrrhotite is commonly pseudomorphed by Pyrite, with complete replacement of the Pyrhottite by sparkling Pyrite crystals. Pyrrhotite is named from the Greek word pyrrhos, which means "color of fire".This is despite the fact that the usual color of Pyrrhotite is a bronze color rather than red; however its tarnish may have hints of sparkling red.
  • New USGS Map Helps Identify Where pyrrhotite, a Mineral ...

    www.usgs.gov/.../new-usgs-map-helps-identify-where-pyrrhotite-a-mineral-can-c... 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. “This project was a bit unusual for us, because typically we’re trying to help people find mineral deposits that they want ...
  • PYRRHOTITE (Iron Sulfide) - Amethyst Galleries

    www.galleries.com/Pyrrhotite Thirdly, pyrrhotite is magnetic or at least weakly so. It is the next most common magnetic mineral to magnetite. Although not all specimens will show great evidence of magnetism if any, some will attract a paperclip or needle suspended from a string or move the needle of a compass.
  • State: Foundations Are Failing At Least In Part Because Of ...

    www.courant.com/news/.../hc-concrete-investigation-results-20160509-story.html Pyrrhotite is a naturally occurring iron sulfide mineral that reacts with oxygen and deteriorates over time. The mineral was also cited in a widespread problem in Quebec as the mineral that ...
  • Pyrrotite - Attack A Crack™ helps Home Owners with ...

    attackacrack.com/pyrrhotite Pyrrhotite WARNING in CT. The Connecticut Department of Housing recently posted a bulletin, stating there are upwards of 35,000 Homes and Businesses in the North, East, and Central parts of Connecticut that are facing a potentially devastating issue due to the presence of a naturally occurring Iron Sulfide(Pyrrhotite) originating from a quarry in Willington.
  • Pyrrhotite | mineral | Britannica

    www.britannica.com/science/pyrrhotite Pyrrhotite, iron sulfide mineral (Fe1–xS) in the niccolite group; in it, the ratio of iron to sulfur atoms is variable but is usually slightly less than one. It commonly is found with pentlandite and other sulfides in silica-poor igneous rocks, as at Kongsberg, Nor.; Andreas-Berg, Ger.; Trentino,