Note 845 — BOOK XIX. THE NATURE AND CULTIVATION OF FLAX, AND AN ACCOUNT OF VARIOUS GARDEN PLANTS.
John Bostock translation
He evidently considers asbestus, or amianthus, to be a vegetable, and not a mineral production. It is, in reality, a mineral, with long flexible filaments, of a silky appearance, and is composed of silica, magnesia, and lime. The wicks of the inextinguishable lamps of the middle ages, the existence of which was an article of general belief, were said to be made of asbestus. Paper and lace, even, have been made of it in modern times.