Hundreds of basement walls in northeastern Connecticut are crumbling, decades after they were built, according to press reports. As homeowners experts search for an explanation, experts are looking at the mineral "pyrrhotite," which contains iron and sulfur that is known to damage concrete.

In fact, a Connecticut quarry operator whose stone is suspected of containing the problematic mineral has agreed to stop supplying the material to area batch plants — at least for now. Here, JLC's Ted Cushman takes a look at the problem.

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