Antimony is the element represented on the periodic table by the symbol Sb. It is a semi-metal most commonly used as a hardening and strengthening agent in alloy combinations with other elements, particularly lead. China, Russia, Bolivia and South Africa are the main producing countries of this element.
As a pure element, it is fairly rare, but it can be present in over 100 naturally occurring mineral species. Antimony is a solid at room temperature and has a melting point of 1,167.13 degrees Fahrenheit. This element was known to ancient civilizations, and it is mentioned in Egyptian scrolls dating back as far as the 16th century B.C., when antimony sulfide was used as mascara.