Amber

From Srafopedia

The Ancient Greeks in Our World had thought that Amber was the source of electricity.

Amber is a fossil resin much used for the manufacture of ornamental objects. Although not mineralized it is sometimes considered and used as a gemstone. Most of the world's amber is in the range of 30–90 million years old. Semi-fossilized resin or sub-fossil amber is called copal.(Wikipedia)