Assertion: pyrrhotite | /r/HasProperty | mineral
Facets:
Source sentences:
text: Thousands of homes in northeastern Connecticut and western Massachusetts were built on foundations containing pyrrhotite, a mineral that causes concrete to slowly deteriorate as it is exposed to oxygen and water.
text: Pyrite and pyrrhotite are minerals known as iron sulfides.
text: Pyrite and pyrrhotite are minerals known as iron sulfides.