Agatized Fossil Coral Value Guide

Agatized Fossil Coral is a unique geological wonder formed 23-28 million years ago when silica-rich groundwater replaced ancient coral skeletons with chalcedony. These Miocene-era specimens are highly collectible for their intricate floral patterns and were designated as Florida's official state rock in 1979.

What affects the value of Agatized Fossil Coral?

• Clarity and definition of the preserved coral polyp structures.
• The presence of vibrant colors or unique banding within the agate replacement.
• Overall size and weight of the specimen, with a current market value around $35-$38.
• Quality of the polish or the presence of intact druzy quartz crystals in natural voids.

How to Identify Agatized Fossil Coral?

• Look for distinct 'flower' or star-shaped patterns on the surface which represent the original coral polyps.
• Verify the material hardness and translucency characteristic of agate, quartz, and chalcedony rather than soft calcium.
• Check for a waxy or vitreous luster typical of silicified specimens from the Florida and Georgia regions.
• Examine the specimen for natural geode-like cavities lined with tiny quartz crystals.

History of Agatized Fossil Coral

These fossils formed millions of years ago when silica-rich groundwater replaced the calcium carbonate skeleton of coral colonies. This specific type of mineralization is frequently found in the Miocene-era deposits of Florida and Georgia, and it was designated the official state rock of Florida in 1979.