Amber – fossilized resin of Tertiary trees

Amber – fossilized resin from prehistoric trees

Amber is a natural organic material formed through the long-term transformation of resin produced by ancient trees. From a mineralogical perspective, it is not a true mineral because it does not have a uniform chemical composition or a regular crystal structure. Nevertheless, it is traditionally classified among organic gem materials and has been used for thousands of years to make jewelry, beads, decorative objects and collector’s specimens.

Amber most commonly occurs in yellow, honey, golden, orange and brown shades. White, cream, reddish, greenish and very dark varieties are also known. Its transparency ranges from almost clear to completely opaque. Cloudiness may be caused by microscopic bubbles, fine particles, plant remains or changes within the internal structure.

Some pieces of amber contain preserved plant fragments, pollen grains or small animals that became trapped in fresh resin before it hardened. These inclusions may have considerable paleontological value. Most commercially available amber is tens of millions of years old, although its age and origin vary according to the specific deposit.

How amber forms

Amber originates from plant resin released by prehistoric trees after damage to the bark or as part of their natural defense system. Fresh resin flowed over the surface of the tree and trapped small impurities, plant fragments and occasionally insects or other small organisms.

After falling to the ground or entering water, the resin was gradually buried beneath sediments. In an environment with limited oxygen, chemical processes such as polymerization and oxidation continued over millions of years. The originally soft and sticky resin was slowly transformed into a solid and more stable fossil material.

Younger and less completely transformed fossil resins are known as copal. Amber and copal cannot always be distinguished reliably by appearance alone because both materials may have a similar color and overall appearance. Professional identification therefore relies on physical properties and laboratory methods such as infrared spectroscopy.

Major amber localities

Amber occurs in sedimentary rocks from different geological periods. Material from individual regions varies in age, chemical composition, color, transparency and the types of preserved inclusions.

• Baltic Sea region: The world’s most important source of amber, especially the variety known as succinite. Major deposits are associated with Poland, Lithuania, Latvia and the Kaliningrad region.
• Dominican Republic: Known for highly transparent amber, numerous biological inclusions and rare specimens displaying bluish optical fluorescence.
• Myanmar: Burmese amber, also known as burmite, comes mainly from Cretaceous sediments and is famous for exceptionally well-preserved fossil inclusions.
• Mexico: The Chiapas region produces yellow, orange to reddish amber, often with good transparency.
• Ukraine, Romania, Italy and other regions: These areas produce regional types of fossil resin with different properties and geological ages.