Libby Vermiculite

Libby vermiculite is a vermiculite ore mined near Libby, Montana, that was heavily contaminated with a toxic form of amphibole asbestos, including tremolite and richterite often called Libby amphibole. Sold for decades under the brand Zonolite for insulation and gardening, it exposed workers, their families, and whole communities. The mine, run by W.R. Grace, caused one of the worst asbestos disasters in U.S. history.

Origin

Vermiculite mining at Libby began in the 1920s and expanded under W.R. Grace after 1963. The ore's asbestos contamination was recognized internally long before the public health crisis was exposed publicly in 1999 and 2000.

Significance in Asbestos Context

Libby matters because contamination reached far beyond miners. Zonolite insulation went into millions of homes, and Libby ore was shipped to processing plants nationwide, so exposure wasn't limited to Montana. The EPA declared a public health emergency there in 2009. If you lived near Libby, worked at a plant that processed its ore, or had Zonolite insulation, that history can be central to identifying the source of your exposure and the responsible company.

Example Sentence

Testing traced the tremolite fibers in the patient's lungs to Zonolite attic insulation made from Libby vermiculite.

Related Terms

W.R. Grace, Zonolite, Tremolite, Vermiculite, Libby Amphibole, Take-Home Exposure

Notes

• If you lived near Libby, worked with vermiculite, or have Zonolite insulation, tell your doctor and legal team; it points to a specific exposure source.
• Don't disturb suspected Zonolite insulation yourself; have it professionally tested and abated.
• Ask about the W.R. Grace bankruptcy trust and EPA Libby programs, which are avenues for affected patients and families.