Asbestos
Asbestos is so called from being inextinguishable even by showers and storms, if once set on fire. The Pagans made use of it for lights in their temples. It is of woolly texture, and is sometimes called the Salamander's feather. Leonardus says: "Its fire is nourished by an inseparable unctuous humid flowing from its substance; therefore, being once kindled, it preserves a constant light without feeding it with any moisture."