The resin has hardened over millions of years and has become hard. Amber is found at many places in the world. There are several deadlines for fossil resin can be called amber, the most accepted is that it has to be more than 20 million years old. Baltic Sea / Baltic-amber is called specifically for Succinite and is derived from a variety of coniferous species of Pinus and Araucari. Amber inclusions are sometimes, pieces of leaves, bark and insects are common. Younger fossil resin is called copal and is not always completely hardened.