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Carcinogenic erionite is found at sites in Arizona, New Mexico, Colorado, Utah, Nevada, California, Oregon, Idaho, Wyoming, Washington, and Montana, along with North and South Dakota.

Mesothelioma, an exceedingly rare and lethal form of cancer, was once thought to be caused only by inhaling asbestos fibers. But erionite—present at scores of sites in the western U.S., including Arizona—is a fibrous mineral that can be up to 800 times more carcinogenic than asbestos. Read more»