Note: Do not rely on this information. It is very old.
JamesoniteJamesonite, a mineral consisting of the sulphides of lead and antimony, which occurs as crystals of the rhombic system in Cornwall, Hungary, Siberia, and Brazil. It frequently contains small quantities of iron, has a specific gravity of 5.7, and varies in colour from steel grey to almost black.
Click for more about Jamesonite