Amber is a hard, translucent fossil resin, that takes millions of years and involves oxidation and polymerization of the original organic compounds, oxygenated hydrocarbons. Over several hundred years the tree sap hardens into what looks like a kind of rock. The trapped bug can be seen by holding amber up to sunlight. It is used for making jewelry and other ornamental objects.
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Amber is 42 years old (birthdate: May 9, 1969).
Amber
... a subgroup of minerals. Most gemstones are silicates.But others are known, notably diamond, though there are an occasional carbonate.And Jet for example is a high pressure form of lignite, and amber is fossilized resin.
the amber museum is one of the landmarks
A lot of resins are used in varnishes. Printer's varnish uses copal resin, polyurethane varnish uses polyurethane, amber varnish contains amber.