Note 837 — Chapter III · INDUSTRY: PERFUMERS, BARBERS, GOLDSMITHS, LAPIDARIES, ETC.
Reading edition
“Is vulgo putatur in tenebris carbonis instar lucere; fortassis quia Pyropus, seu Anthrax appellatus à veteribus fuit.” Anselm, Boet. Gemmarum et Lapidum Historia, t. ii. c. viii. p. 140.