A Naturally Occurring Mineral
The majority of the world's vermiculite was from a mine in Libby, Montana, USA. The mine operated since 1963 under W.R. Grace.
Through a marketing campaign Vermiculite was touted as The Miracle Mineral being Vermiculite has great heat and fire-resistant properties and was therefore offered to the public as an building insulation product.
In the late 1970s and early 1980s, the Canadian federal government offered homeowners grants if you installed vermiculite insulation in your home. Zonolite in their homes. Many did. Little did homeowners know, those accordion-like pieces may contain asbestos fibres
and there lay the fall from Grace.
A Fall From Grace.
Because of the transient nature of the work force, it might never be known how many processing plant workers died from inhaling tremolite asbestos, a rare and extremely toxic form of asbestos released by mining for vermiculite, the paper said.
Mine owner W. R. Grace & Co., and previous owner Zonolite Co., ignored the dangers, the newspaper reported. The mine was closed in 1990, but health officials say asbestos-related contamination continues to affect people.
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Follow the ending link to learn more. http://www.zonoliteatticinsulation.com/faqs/