What is Amber
The following material was taken from the World of Amber by Susan Ward Aber, with permission.
Amber is the fossilized resin of ancient trees which forms through a natural polymerization of the original organic compounds. Most of the world's amber is in the range of 30-90 million years old.
Amber is known to mineralogists as succinite, from the Latin succinum, which means amber. Heating amber will soften it and eventually it will burn, a fact that has given rise to the name of bernstein, by which the Germans know amber. Rubbing amber with a cloth will make it electric, attracting bits of paper. The Greek name for amber is elektron, or the origin of our word electricity. Amber is a poor conductor of heat and feels warm to the touch (minerals feel cool). The modern name for amber is thought to come from the Arabic word, amber, meaning ambergris. Ambergris is the waxy aromatic substance created in the intestines of sperm whales. The substance is related to cholesterol and is formed to protect the sperm whale from the sharp beaks and stings of its major food source, the giant squid. Ambergris was used to make perfumes. Ambergris and amber are only related by the fact that both wash up on beaches.
Amber studies are truly interdisciplinary. Geologists and paleontologists are interested in amber because it is a fossil, evidence of prehistoric life. Archeologists look at trade routes and the barter view of amber. Organic chemists investigate the physical and chemical properties. Botanists and entomologists examine the botanical sources of amber and embalmed insects and debris. Poets, writers, and artists look to amber for sunny inspirations. Gemologists and jewelers desire amber for its beauty and rarity. Curators and conservationists preserve and archive amber.
How is amber formed?
Amber is a fossilized resin, not tree sap. Sap is the fluid that circulates through a plant's vascular system, while resin is the semi-solid amorphous organic substance secreted in pockets and canals through epithelial cells of the plant. Land plant resins are complex mixtures of mono-, sesqui-, di-, and triterpenoids, which have structures based on linked isoprene C5H8 units (Langenheim, 1969, p. 1157). Volatile terpenoid fractions in resins evaporate and dissipate under natural forest conditions, leaving nonvolatile terpenoid fractions to become fossilized if they are stable enough to withstand degradation and depositional conditions. The fossil resin becomes incorporated into sediments and soils, which over millions of years change into rock such as shale and sandstone.
Therefore, amber is formed as a result of the fossilization of resin that that takes millions of years and involves a progressive oxidation and polymerization of the original organic compounds, oxygenated hydrocarbons. Although a specific time interval has not been established for this process, the majority of amber is found within Cretaceous and Tertiary sedimentary rocks(approximately 30-90 million years old.
For more information please visit http://www.emporia.edu/earthsci/amber/amber.htm.
