a chemical element with symbol Sb (from Latin: stibium) and atomic number 51. A lustrous gray metalloid, it is found in nature mainly as the sulfide mineral stibnite (Sb2S3). Antimony compounds have been known since ancient times and were used for cosmetics; metallic antimony was also known, but it was erroneously identified as lead. It was established to be an element around the 17th century.

Beautiful, sparkling lumps of broken crystal like this are how bulk antimony is commonly sold. Most of it is melted down and added to lead to make bullets and batteries or alloyed with other metals.