The Chalcolithic (Ancient Greek: khalkós, "copper" + Ancient Greek: líthos, "stone") period or Copper Age, also known as the EneolithicÆneolithic (from Latin aeneus "of bronze"), is a phase of the Bronze Age before metallurgists discover that adding tin to copper forms the harder bronze.

The Copper Age is originally defined as a transition between the Neolithic and the Bronze Age.

However, because it is characterized by the use of metals, the Copper Age is usually considered a part of the Bronze Age rather than the Stone Age.he archaeological site of Belovode on the Rudnik mountain in Serbia contains the world's oldest securely dated evidence of copper making at high temperature, from 5,000 BCE.