Note 3158 — BOOK XXXVII. THE NATURAL HISTORY OF PRECIOUS STONES.
John Bostock translation
Ultramarine is prepared from Lapis lazuli, and an artificial kind is extensively in use, which equals the native in permanency and brilliancy of colour, and is very extensively employed in the arts. Theophrastus, De Lapid. sec. 55, speaks of this artificial ultramarine.