'''Asbestos''' is a group of naturally occurring minerals which are hydrous magnesium silicates, and which separate into long, thin fibers. An extraordinarily fire-resistant, strong and durable substance, it was used for many years to insulate and fireproof buildings. | '''Asbestos''' is a group of naturally occurring minerals which are hydrous magnesium silicates, and which separate into long, thin fibers. An extraordinarily fire-resistant, strong and durable substance, it was used for many years to insulate and fireproof buildings. |