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Amber is a fossil resin.
The English name comes from the Arabic anbar,
probably through Spanish , but this word referred originally to ambergris, which is an animal substance quite distinct from yellow amber.
The German word is Bernstein ("burn stone"), which comes from the Middle Low German bernen which means burning, this word is a cognate to Dutch barnsteen.
This is likely related to the fact that amber can, indeed, burn.
The Polish bursztyn was derived from the German name.

Most of the world's amber is in the range of 30-90 million years old.

Amber inclusions
The resin contains, in addition to the beautifully preserved plant-structures,
numerous remains of insects, spiders, annelids, crustaceans and other small organisms which became enveloped while the exudation was fluid.

Although amber is found along the shores of a large part
of the Baltic Sea and the North Sea.