6.6" Agatized Fossil Coral (Blue Chalcedony) - Florida

This is a beautiful, 6.6" wide specimen of agatized coral from the Basin Deposits of North Florida. This fossil coral is Miocene (25-32 million years) in age, and was formed when fine sediments covered shallow coral reefs. As silica rich groundwater through the rock that was formed (and exposed as sea-levels dropped), it replaced the calcium carbonate skeleton of the coral with Chalcedony. There are a number of types of fossil coral present, but given the replacement destroys much of the original detail, more specific identification is difficult.

The chalcedony has crystallized in the botryoidal habit, with one end displaying a beautiful blue coloration with a brown/honey colored rind.