Florida State Fossil

Coral is the outside skeleton of tiny ocean animals called polyps, which live in colonies attached to hard underwater surfaces. When alive, polyps combine their own carbon dioxide with the lime in warm seawater to form a limestone-like hard surface, or coral.

Coral is created by sea life. It is the skeletal remains of coral polyps. Coral is calcium carbonate with a trade of carotene. Its color ranges from white to red. Red, pink, and white coral is mostly calcium carbonate. Black and golden coral is conchiolin. It is beautiful in rings, necklaces, and pendants.

Agatized coral occurs when silica in the ocean water hardens, replacing the limy corals with a form of quartz mineral known as chalcedony. This long fossilization process (20–30 million years) results in the formation of a "pseudomorph," meaning that one mineral has replaced another without having lost its original form. In 1979 agatized coral was designated the official state stone.

Agatized coral is found in three main Florida locations: Tampa Bay, the Econfina River, and the Withlacoochee/Suwannee River beds.