Wiktionary
a. aeneolithic
Wikipedia
The Chalcolithic (; khalkós, " copper" and líthos, " stone") period or Copper Age, also known as the Eneolithic or Æneolithic (from Latin aeneus "of copper"), is a phase of the Bronze Age before it was discovered that adding tin to copper formed the harder bronze. The Copper Age was 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 considered a part of the Bronze Age rather than the Stone Age.
The archaeological site of Belovode on the Rudnik mountain in Serbia contains the world's oldest securely dated evidence of copper smelting from 5,000 BCE.
Usage examples of "chalcolithic".
They'll hear about a raid where you evidently perished: not Ranger work, as far as they can tell from the confused native accounts, just an attack by an ambitious chalcolithic chief who'd heard Jutland was in trouble and saw his chance and was so lucky that stray arrows got you and Hu before you could drive him off.