Chalcolithic

The Chalcolithic (greek chalkos + lithos, "copper stone") period, also known as the Eneolithic period, is a phase in the development of human culture in which the use of early metal tools coexists with the use of stone tools.

The period is a transitional one outside of the traditional three-age system, and occurs between the neolithic and bronze age. It is apparently only distinguished by Archaeologists in some parts of the world, e.g., Europe and West and Central Asia.