30/01/2025
Agatized fossil coral from Tampa, Florida , USA seen in UV SW. 20cm across. The transformation of coral into agatized coral begins with the death of the coral polyps, leaving behind their hard, calcium-carbonate-based skeletons. The coral skeletons become buried in sediment, which helps to protect them from degradation. Over time, minerals such as agate, calcite, or silicate replace the calcium carbonate that composes the coral's structure. This replacement not only preserves the intricate details of the ancient coral but also imparts a distinctive banded appearance to the resulting stone, known as agatized coral. In Tampa, Florida, agatized coral, designated as the state stone, offers a glimpse into the distant past, dating back approximately 38 to 25 million years during the Oligocene-Miocene period.
