What is jet primarily composed of?

Jet is primarily composed of carbon, which is the defining characteristic of this organic gemstone. Formed from the fossilized wood of ancient trees, jet undergoes a process of polymerization and oxidation over millions of years. It is noteworthy for its deep black color and lightweight properties, which have made it historically popular for use in jewelry and other decorative items.

The composition of jet primarily as carbon distinguishes it from other materials that make up different gemstones. For instance, silicon is a major component of many minerals, calcite is a form of calcium carbonate, and alumina refers to aluminum oxide, which is present in various gemstones but not in jet. Understanding these distinctions helps in identifying and classifying jet correctly as a unique gemstone within the broader spectrum of organic materials.