Note 947 — BOOK XXXIII. THE NATURAL HISTORY OF METALS.647
John Bostock translation
“Thracius lapis.” This stone, which is mentioned also by Nicander, Galen, Simplicius, and Dioscorides, has not been identified. Holland has the following Note on this passage: “Which some take for pit-cole, or sea-cole rather, such as commeth from Newcastle by sea; or rather, a kind of jeat (jet).” In either case, he is probably wide of the mark, neither coal nor jet igniting on the application of water.