Antimony is a metalloid with a shiny silver grey color in its natural solid state. It is a crystalline solid, and as a metalloid it has poor heat and electrical conductivity traits. Antimony has an atomic mass of 121.760, a melting point of 1167.13 °F, and a boiling point of 2889 °F. The main use of antimony is as a hardener added to lead for storage batteries; antimony is also used in matches, plumbing, soldering, and as a semiconductor for diode production.