Erionite is a microscopic volcanic fibrous mineral which is located throughout the hollows of rock formations and which has been categorized as a class I carcinogenic agent by the International Agency for Research on Cancer . The inhalation of erionite poses the same type of health effects that are associated with asbestos, such as malignant pleural mesothelioma. A very high incidence of mesothelioma, a consequence of ubiquitous environmental exposure to erionite and tremolite asbestos, has...