pyrrhotite
noun
pyr·rho·tite
ˈpir-ə-ˌtīt 
: a bronze-colored mineral of metallic luster that consists of ferrous sulfide and is attracted by a magnet
Examples of pyrrhotite in a Sentence
Recent Examples on the Web
The conference, too, revealed a quarry in Massachusetts that had tested positive for pyrrhotite.
—
The Editors, JSTOR Daily, 31 Dec. 2024
Mineralization is recorded as hosted within a graphitic sediment horizon with quartz-carbonate veins and semi-massive to massive pyrite, chalcopyrite, sphalerite and pyrrhotite.
—Sacramento Bee, 13 June 2024
KoBold Metals Brownish flecks in this core sample, KSC 22-07, reveal the presence of magmatic pyrrhotite.
—Josh Goldman, IEEE Spectrum, 29 Apr. 2023
Concrete used in homes in Eastern Connecticut contained the mineral pyrrhotite, which degraded foundations.
—Jesse Leavenworth, courant.com, 8 June 2021
Fresh funding for the study of crumbling foundations in the state, appears to be paying dividends, lowering the cost of testing for pyrrhotite to nothing for some homeowners, including residents at Ryefield Condominiums in Vernon.
—Steven Goode, courant.com, 26 Oct. 2020
This pyrrhotite problem is the first of its kind in the United States.
—Washington Post, 29 July 2019
The Hartford Courant reports tens of thousands of homes could be at risk of having a foundation fail because of an iron sulfide called pyrrhotite.
—USA TODAY, 12 Nov. 2019
The material containing pyrrhotite has been traced to a Willington quarry used between 1983 and 2015 by a now-defunct concrete company.
—Washington Post, 29 July 2019
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The Editors, JSTOR Daily, 31 Dec. 2024
Mineralization is recorded as hosted within a graphitic sediment horizon with quartz-carbonate veins and semi-massive to massive pyrite, chalcopyrite, sphalerite and pyrrhotite.
—Sacramento Bee, 13 June 2024
KoBold Metals Brownish flecks in this core sample, KSC 22-07, reveal the presence of magmatic pyrrhotite.
—Josh Goldman, IEEE Spectrum, 29 Apr. 2023
Concrete used in homes in Eastern Connecticut contained the mineral pyrrhotite, which degraded foundations.
—Jesse Leavenworth, courant.com, 8 June 2021
Fresh funding for the study of crumbling foundations in the state, appears to be paying dividends, lowering the cost of testing for pyrrhotite to nothing for some homeowners, including residents at Ryefield Condominiums in Vernon.
—Steven Goode, courant.com, 26 Oct. 2020
This pyrrhotite problem is the first of its kind in the United States.
—Washington Post, 29 July 2019
The Hartford Courant reports tens of thousands of homes could be at risk of having a foundation fail because of an iron sulfide called pyrrhotite.
—USA TODAY, 12 Nov. 2019
The material containing pyrrhotite has been traced to a Willington quarry used between 1983 and 2015 by a now-defunct concrete company.
—Washington Post, 29 July 2019
Cite this Entry
“Pyrrhotite.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pyrrhotite. Accessed 14 Jul. 2025.
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