Asbestos
Definition
A group of naturally occurring fibrous silicate minerals: chrysotile (serpentine) and the regulated amphiboles (crocidolite, amosite, tremolite, actinolite, anthophyllite). Defined analytically as fibres with aspect ratio >3:1 and length >5 micrometres. Regulated as a class-1 carcinogen.
- Serpentine variety
- Chrysotile
- Amphibole varieties
- Crocidolite, amosite, tremolite, actinolite, anthophyllite
- Fibre definition
- Aspect ratio greater than 3:1, length over 5 micrometres
- Regulatory class
- Class-1 carcinogen
Common questions
Why does the fibre-dimension definition matter analytically?+
Regulatory and analytical counting methods only classify a particle as a countable asbestos fibre if it meets the aspect-ratio and length thresholds, so particles that are chemically asbestos but fall short of these dimensions are excluded from the regulated fibre count.
Are all six asbestos types equally hazardous?+
No, potency varies by type and exposure route: the amphiboles, particularly crocidolite, are generally considered more potent for mesothelioma risk than chrysotile per unit exposure, though all six remain regulated as class-1 carcinogens.
Related terms
- Fly Ash
- Spherical or hollow glass particles collected from flue gas during coal combustion; dominated by Si-Al-Fe chemistry with trace-element profiles reflecting the coal...
- Geoforensic Location Indicator
- A combination of particle types on clothing or in a vehicle whose presence or proportions narrow the possible locations where the person...
- Manufactured Mineral Fibre (MMF)
- Man-made fibrous materials (glass wool, rock wool, ceramic fibre) used as insulation; resembles asbestos morphologically but has different elemental composition (no iron...
- Phase Contrast Optical Microscopy (PCOM)
- The WHO-recommended routine method for counting airborne asbestos fibres in occupational and environmental samples; counts fibres visible at 400-500x magnification, with confirmation...
- SEM-EDX
- Scanning electron microscopy with energy-dispersive X-ray spectroscopy. The electron beam excites characteristic X-rays from each element present in the target grain, giving...