Fossil Coral is a natural stone that is formed when ancient coral, once a living organic, marine animal leaves behind a skeleton that is fossilized and preserved. These coral remains are gradually replaced with agate, a variety of naturally occurring chalcedony, or microcrystalline quartz, finally becoming a stone. It typically appears as beautiful flower like formations in the stone.
The entire process can take over 20 million years and occurs only under very unique geological conditions.
Fossil coral should not be mistaken for endangered or protected reef coral or precious coral. It is considered to be a type of agate or chalcedony, rather than a type of coral, due to its silicon dioxide composition.