Four Assorted Fossil Coral Cabs

Here are four polished fossil coral cabs of varying size and shape. This 20 million year old agatized coral from Indonesia has a beautiful sunburst pattern.

These corals are approximately 20 million years old and are the remains of ancient reefs thrust up into the mountains by the collisions of tectonic plates. As these corals fossilized the original organic material was replaced by silica, iron, manganese and other minerals