Amber is not a mineral. It is fossilized tree resin and it takes millions of years and the specific burial conditions for Amber to form.
It has been appreciated for its colour and natural beauty since Neolithic times. Much valued from antiquity to the present as a gemstone, amber is made into a variety of decorative objects. Amber is used in jewellery. It glows when polished and held up to light. The most common colours of amber are in the yellow to orange range, but also can occur in green or blue due to the inclusion of plant material.
Amber has an amorphous rather than crystalline structure. It has a very low specific gravity, which means that it is exceptionally light allowing it to will float in salt water. Amber is quite soft and can even be dented by a fingernail, it can flake, is powdery when scratched and will warm up quickly in your hand.
Most Amber deposits are found in the Baltic region. It is estimated that there have been over 105 tons of Baltic Amber produced by the Palaeogene forests in Northern Europe. It is the largest known deposit of fossilized plant resin on earth.