Note 976 — BOOK XXXIII. THE NATURAL HISTORY OF METALS.647
John Bostock translation
Ajasson thinks that under this name, crude antimony or sulphuret of antimony may have been included; as also sulphuret of lead, sulphuret of antimony and copper, and sulphuret of antimony and silver; the last of which is often found covered with an opaque pellicle.