Antimony (Sb)
Antimony (Sb): The Brittle, Ancient Semi-Metal
Antimony is a silvery, hard, and brittle semi-metal that has been known since ancient times. Its name comes from the Greek words anti and monos, which may mean “not alone”—a reference to how it’s usually found combined with other elements. Civilizations have used antimony for over 5,000 years, from cosmetics to metallurgy.
Why Is Antimony Useful?
Antimony is prized for its ability to harden metals and for its role in modern industry:
Alloys: Added to lead to make it harder and stronger. Lead–antimony alloys are essential for car batteries, bullets, and the old printing press “type metal.”
Electronics: Used as a semiconductor in devices like infrared detectors and diodes.
Flame Retardants: Antimony compounds are added to fabrics, paints, and plastics to make them resistant to fire.
Historical Uses: In ancient times, the mineral stibnite (antimony sulfide) was ground into a fine powder and used as kohl, a black pigment for eye makeup.
Natural Abundance & History
Antimony is not very common but is found in over 100 minerals, most often as stibnite (Sb₂S₃). It can also occur in small amounts in pure form. Today, about 88% of the world’s antimony is produced in China.
5,000 years ago: A vase made of antimony was crafted in Mesopotamia (modern Iraq).
Ancient Egypt & Babylon: Antimony sulfide was used as a pigment and glaze for decorative objects.
Medieval Europe: Doctors even prescribed antimony “pills” as laxatives—and in some cases, the same pill was reused multiple times!
Biological Role
Antimony has no biological role. Many of its compounds are toxic and must be handled with care.