Amber

Hardness: 7 (Mohs scale); Color: Typically translucent to opaque yellow, yellowish-brown, golden-yellow, honey-yellow. Can also be white, clear, red, green, black, or blue; Luster: Resinous to waxy; Crystal Structure: Amorphous (not crystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 1.05-1.12.

Amber forms from the fossilization of tree resin over millions of years. This process involves the hardening of resin through polymerization, oxidation, and other chemical changes, often occurring after the resin has been buried in sediment. Most commercially available amber, such as Baltic amber, dates back to the Eocene epoch (approximately 35-50 million years ago), originating from extinct pine tree species. Dominican amber is generally younger, from the Oligocene-Miocene epochs (20-30 million years ago).

Amber is primarily used as a gemstone in jewelry, valued for its warm colors and light weight. It is carved into beads, pendants, cabochons, and other ornamental objects. Historically, it was used in folk medicine, believed to have healing properties. It is also highly prized by collectors, especially pieces containing well-preserved inclusions of insects, plants, or other organisms. Lower-grade amber can be used to make varnishes or as an ingredient in certain perfumes.

Amber is not a mineral in the strict sense, as it is an organic gem material formed from fossilized tree resin, not inorganic matter with a defined crystal structure. However, it is often classified and treated as a mineral in the gemological and geological communities. Its ability to preserve ancient insects and plant matter makes it incredibly valuable for scientific study, offering a direct window into prehistoric ecosystems. The film 'Jurassic Park' popularized the idea of extracting dinosaur DNA from mosquitoes preserved in amber, although this is largely fictional due to DNA degradation over such long periods.

In the field, amber can be identified by its light weight (it often floats in saltwater), its waxy or resinous feel, and its ability to become electrostatically charged when rubbed (a property known as the 'electrum effect' from which the word 'electricity' derives). When heated, it gives off a characteristic faint pine smell. Genuine amber can also be tested by its reaction to alcohol (it will become sticky or dissolve slightly) and acetone (which can damage it). It's commonly found along the shores of the Baltic Sea (Baltic amber), in the Dominican Republic (Dominican amber), and also in Myanmar (Burmite) and Mexico (Chiapas amber). Collectors should look for clarity, color, and especially for interesting inclusions. Imitations like copal (younger resin) or plastic are common and can sometimes be distinguished by their smell when heated or by being soft to a hot needle point.