Asbestos Asbestos is a mineral which has been widely mined and processed throughout the world. It is a natural fibre that comes in three basic forms: white (chrysotile), blue (crocidolite) and brown (amosite). Asbestos was exploited commercially for their desirable physical properties. They all have in common their asbestiform habit, long, (1:20) thin fibrous crystals. The most commonly found building materials that contain asbestos are asbestos cement products. The use of all forms of asbestos has been banned nationally since 31 December 2003.