Amber

Amber is not a mineral - it's fossilized tree resin, typically 20-100 million years old. When ancient coniferous trees exuded resin (as a defense against insects and disease), some of that resin became buried in forest sediment. Over millions of years, heat and pressure polymerized the resin through a process called amberization, transforming sticky tree sap into a hard, durable organic gem.

Amber's greatest scientific value is as a preservation medium. Insects, spiders, feathers, plant material, and even small lizards trapped in flowing resin were perfectly preserved in three dimensions - frozen in time with cellular-level detail. Burmese amber (99 million years old) has yielded spectacular Cretaceous inclusions including a dinosaur tail with feathers and the oldest known bee.

Dominican blue amber is one of the rarest gem varieties on Earth. The blue fluorescence (visible in sunlight against a dark background) is caused by aromatic hydrocarbons produced when the original resin from the extinct Hymenaea protera tree polymerized under specific conditions found only in the Dominican Republic.

Amber is identified by its low density (1.08 - it floats in saturated salt water), warmth to the touch (unlike glass or plastic), and static charge (rubbed amber attracts small pieces of paper). The word 'electricity' comes from 'elektron,' the Greek word for amber.

Distinguish from copal (younger, unfossilized resin - dissolves in acetone, amber doesn't), plastic (doesn't float in salt water, no static), and pressed amber (reconstructed from small pieces - shows flow lines under magnification). The hot needle test releases a pine-like aroma from genuine amber, while plastic smells acrid.