Definition
One of the six regulated types of asbestos (CAS 77536-66-4), belonging to the amphibole mineral group. Actinolite forms long, thin, needle-like crystals that can be green, white, or grey. It was not used commercially as a standalone material but occurs as a contaminant in other minerals such as vermiculite and talc. When present in fibrous form, actinolite poses the same inhalation risks as other asbestos types, including mesothelioma and lung cancer.
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Amphibole Asbestos
A group of asbestos minerals with straight, needle-like fibers that are considered more harmful than chrysotile. Includes crocidolite (blue asbestos), amosite (brown asbestos), anthophyllite, tremolite, and actinolite. Amphibole fibers are more durable in lung tissue and are associated with higher rates of mesothelioma. These types are less common but more dangerous when exposure occurs.
Tremolite
An amphibole asbestos mineral (CAS 77536-68-6) that forms white to dark-green prismatic crystals. Tremolite was not mined commercially for industrial use but is commonly found as a contaminant in chrysotile asbestos, vermiculite insulation (notably from the Libby, Montana mine), and talc products. Its presence as a contaminant has been linked to significant occupational and environmental exposure, and it is classified as a Group 1 carcinogen by the IARC.
Asbestos
A group of naturally occurring fibrous minerals composed of thin, needle-like fibers. Asbestos was widely used in construction and manufacturing due to its heat resistance, strength, and insulating properties. When disturbed, asbestos releases microscopic fibers that can be inhaled, causing serious health problems including lung cancer, mesothelioma, and asbestosis. All types of asbestos are now recognized as carcinogenic.