Note 1159 — BOOK XXXIII. THE NATURAL HISTORY OF METALS.647 (continued 2)
John Bostock translation
“It is possible that the ‘cæruleum’ of the ancients may in some cases have been real ultramarine, but properly and in general, it was only copper ochre.”—Beckmann’s Hist. Inv. Vol. I. p. 472. Bohn’s Edition. Delafosse identifies it with blue carbonate and hydrocarbonate of copper, one of the two azurites.