Asbestos minerals can be classified into two groups, amphibole and serpentine, according to the physical make up of the fibres.
Amphibole asbestos contains long sharp fibres with a high length to width ratio. This group includes:
- Crocidolite (blue asbestos)
- Amosite (brown asbestos).
- By contrast serpentine asbestos has long curved fibres.
- Chrysotile (white asbestos) is the only commercial form of serpentine asbestos.