Agent Name


CAS Number

12510-42-8; 66733-21-9


Al.Ca.30H2-O.K.Na.O5-Si2.O; Al2-O18-Si7.1/2Ca.7H2-O.1/2Na

Major Category

Mineral Dusts


Fibrogenic Dusts


White fibrous crystals; [NTP]


"Occupatonal exposures occur during mining, milling and processing of some zeolites as well as during agricultural work in areas in which soils are contaminated with erionite." [IARC] Zeolites are used in water softeners, detergents, cracking catalysts, adsorbents, desiccants, and solar collectors; [Hawley] Zeolites are used for "pet litter, soil conditioners, animal feed, waste-water treatment, gas absorbents, etc." Erionite deposits exist in Arizona, Nevada, Oregon, and Utah. [NTP] Workers may be exposed in waste treatment, agricultural waste, air pollution control systems, cement aggregates, and building materials; [Siemiatycki, p. 326]


Natural zeolites include analcite, chabazite, heulandite, natrolite, stilbite, and thomosonite. [Hawley] Erionite is one of about 40 natural zeolites, which are "hydrated aluminosilicates of the alkaline and alkaline-earth metals." Studies of Turkish villages with high dust exposures to erionite found increased incidence of mesotheliomas, and erionite fibers were found in lung tissue samples. Erionite causes mesothelioma in experimental mice and rats. [NTP]


Erionite is no longer commercially mined; [NTP]

Reference Link

Prospective study of mesothelioma mortality in Turkish villages with exposure to fibrous zeolite.

Exposure Assessment
Reference Link

Assessing occupational erionite and respirable crystalline silica exposure among outdoor workers in Wyoming, South Dakota, and Montana.

Adverse Effects
IARC Carcinogen

Known Carcinogen

NTP Carcinogen

Human Carcinogen

Links to Other NLM Databases
Toxicity Information


Chemical Information

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Biomedical References

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Related Information in HazMap

Occupational diseases associated with exposure to this agent:


Industrial Processes with risk of exposure: