Atomic number: 51

Symbol: Sb

Category: metalloid

Density at 25°C: solid:  6.697 g·cm−3

No, it's not anti money. This element is an metalloid but is rarely found by itself, usually it is found in combination with minerals. It mostly ends up in alloys with tin and lead.  Also it ends up with bromine as part of fire fighting retardants. 

Antimony crystal. image: adapted from wikipedia

Use, natural applications or common combinations: 

  • Some pigments
  • starting to be used in semiconductors.

Basic characteristics:

  • Standard atomic weight: 121.760(1)
  • Melting point:  630.63 °C
  • Boiling point: 1587 °C
  • Radioactivity: almost all naturally stable.